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  1. Extrema Ratio 5items
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14 Items

  1. ExtremaRatio - Lamborghini Reventón Knife - Limited Edition - PRIVATE COLLECTION - 117 - Knife

    Previously owned knife withdrawn from a private collection.

    Type: Previously Purchased
    Condition: Like new
    Availability: Out of production - Limited edition item
    Sharpening: Factory standard
    Blade marks: None
    Handle marks: None
    Box: Included
    Sheath: Not available
    Manuals, Certificates, and Warranties: Included
    Inspected and Certified by our internal laboratory
    Extrema Ratio was chosen by Automobili Lamborghini to produce the Reventón Folder, an emergency knife, seat belt cutter, and glass breaker, designed by the Lamborghini Style Center, and officially included with each of the 20 Reventóns produced, the most exclusive supercar by the House of the Bull.

    The “Reventón Folder” is a high-level functional and aesthetic accessory, clearly in line with the philosophy of the car, created with concepts and technologies directly borrowed from the most advanced aeronautical industry.

    The knife is produced in a limited edition of 2,000 pieces, the first twenty of which equip the Reventóns, and the remaining 1,980 are available for collectors.

    Usage: Collection
    Type of production: Industrial
    Country of production: Italy
    Blade: Stainless steel N690Co 58HRC
    Blade finish: Testudo burnishing
    Handle: Anticorodal
    Blade length: 120mm
    Blade thickness: 6.3mm
    Closed length: 155mm
    Total length: 260mm
    Thickness when closed: 21mm
    Weight: 235g
    Locking mechanism: Back Lock with safety catch
    Clip: Not available
    Sheath: Not available
    Packaging: Plastic box with Lamborghini and Reventon logos
    Note: Item number 117 out of 2000

    AP-REV-ER1
    €483.61
    Only 1 left
    Only 1 left
  2. ExtremaRatio - MPC Desert Warfare - 2014 Full Set - PRIVATE COLLECTION - Knife

    KNIFE WITHDRAWN FROM PRIVATE COLLECTION
    * Type: Previously Purchased
    * Condition: 2014 knife overall in near new, unused condition, some minor marks on metal parts given by age
    * Commercially available Discontinued.
    * Sharpening: Factory sharpened, never used for cutting.
    * Marks on blade: No
    * Marks on handle: Some discoloration of laser engravings given by age.
    * Box: Present
    * Scabbard: -
    * Manuals, Certificates and Warranties: Present
    * Checked and Certified by our in-house laboratory



    Intended Use: Tactical / Multirole

    Production type: Industrial
    Country of Production: Italy
    Blade: stainless steel N690Co hardened to 58HRC
    Blade Finish: Desert Warfare
    Handle: Anticorodal with stainless steel spacer
    Blade length: 115mm.
    Blade thickness: 6.3mm.
    Total length: 260mm.
    Weight: 245g.
    Lock system: Back Lock with additional safety pin
    Packaging: cardboard box with Extrema Ratio logos
    Notes: Previously purchased discontinued specimen from a private collection. Full set, in near-new condition

    ER-MPCDW-CP
    €409.02
    Only 1 left
    Only 1 left
  3. Medford Knife and Tools - NAV-H Fixed - Bead Blasted D2 & Green G10 - PRIVATE COLLECTION - knife

    KNIFE WITHDRAWN FROM PRIVATE COLLECTION
    * Type: previously purchased
    * Condition: overall in good condition
    * Commercially available: discontinued
    * Sharpening: professionally re-sharpened.
    * Marks on blade: small abrasions given by insertion in Kydex sheath.
    * Marks on handle: small abrasions in a couple of places.
    * Box: Nylon pouch.
    * Scabbard: made of Kydex
    * Manuals, Certificates and Warranties: missing.
    * Checked and Certified by our in-house laboratory

     

    Intended Use: Tactical/Collection

    Production type: MidTech
    Country of manufacture: USA
    Blade: full tang, D2 steel
    Blade finish: microbead blasting
    Handle: G10 green
    Blade length: 95mm.
    Blade thickness: 6.5mm.
    Total length: 230mm.
    Weight: 368g.
    Sheath: kydex, thermoformed, with Tek Lok type attachment
    Packaging: nylon pouch, with zipper closure and Medford logos
    Notes: designed and built by Greg Medford

    AP10517
    €405.74
    Only 1 left
    Only 1 left
  4. ExtremaRatio - Ti-Rock Satin Limited Edition - Laminated CoS & Blue Titanium - PRIVATE COLLECTION - knife

    KNIFE WITHDRAWN FROM PRIVATE COLLECTION
    * Type: Previously purchased
    * Condition: Like new, never taken out of its packaging.
    * Commercially available: Discontinued
    * Sharpening: Factory
    * Marks on blade: None
    * Marks on handle: None
    * Box: Present
    * Scabbard: /
    * Manuals, Certificates and Warranties: Present
    * Checked and Certified by our in-house laboratory


    Coltelleria Collini exclusive - Available in only 33 numbered examples on blade and box


    Intended use: collection / EDC / CQD

    Type of production: industrial, limited
    Blade: Japanese laminated stainless steel (San Mai) with cryogenically hardened 61.5HRC CoS cutting edge; with double concave shank in the strong of the blade
    Blade treatment: satin finish
    Country of manufacture: Italy
    Handle: made of Titanium, machined from solid, with integral Frame Lock system with removable casement and safety made of stainless steel
    Blade length: 75mm.
    Blade thickness: 6.3mm.
    Total length: 180mm.
    Weight: 186g.
    Clip: stainless steel, reversible, deep pocket type and with tip up port
    Notes: tapered Skull Crasher engaged in the tang - Limited and numbered edition of only 33 pieces serialized on the blade and box
    Box: cardboard, numbered, with ExtremaRatio and Coltelleria Collini logos

    TIROCK-C-BL-CP
    €0.00
    Only -20 left
    Only -20 left
    Out of stock
  5. ExtremaRatio - Dobermann II Miles - Full Set first series 2004 - PRE-OWNED - knife

    KNIFE WITHDRAWN FROM PRIVATE COLLECTION
    * Type: Previously Purchased, 2004 first series.
    * Condition: Perfect, like new
    * Commercially available Out of production, replaced by the new versions.
    * Sharpening: Factory sharpened, perfect
    * Marks on blade: None
    * Marks on handle: None
    * Box: Present and perfect
    * Scabbard: Present and perfect
    * Manuals, Certificates and Warranties: - -
    * Checked and Certified by our in-house laboratory




    Intended Use: Tactical / Collection

    Type of Production: Industrial
    Country of Production: Italy
    Blade: stainless steel N690Co
    Blade finish: tumbling "Miles"
    Handle: Forprene
    Blade length: 170mm.
    Blade thickness: 6.3mm.
    Total length: 315mm.
    Weight: 254g.
    Sheath: ballistic rubber
    Packaging: cardboard box with Extrema Ratio logos
    Notes: 2004 first series specimen, with hexagonal hardware, supplied with original box all in like-new condition.

    ER-DOB-MICP
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  6. Strider Knives - 2010 Tiger Stripe BG Gunner Grip Black G10 - PRIVATE COLLECTION - knife

    KNIFE WITHDRAWN FROM PRIVATE COLLECTION
    * Type: Previously Purchased
    * Condition: Overall in very good condition.
    * Commercially available Discontinued; Company no longer in operation as of 2017.
    * Sharpening: Factory.
    * Marks on blade: Normal marks, found on all Strider models with Tiger Stripe finish.
    * Marks on handle: None
    * Box: Originally sold unboxed
    * Scabbard: Original, in Khaki-colored Cordura, by Eagle USA.
    * Manuals, Certificates and Warranties:Originally sold without certificates or warranties.
    * Checked and Certified by our in-house laboratory



    Intended Use: Tactical / Collection

    Type of manufacture:Midtech
    Country of Production: USA
    Blade: Stainless steel CPM-S30V
    Blade Finish: Tiger Stripe
    Handle: Black G-10 with GG (Gunner Grip) pattern
    Blade length: 160mm.
    Blade thickness: 6.3mm.
    Total length: 298mm.
    Weight: 353g.
    Sheath: Khaki, cordura, by Eagle USA
    Packaging: -
    Notes: 2010 specimen in very good condition - Shows small scuff marks on the Tiger Stripe finish, which is common with any Strider model made with this matte blade finish - Strider knives have always been offered by the company without any box, packaging, manual or certificate - This historic company ceased operations in 2017, after a 25-year career - Mick Strider, the company's previous founding partner, is still in business and dedicated solely to making custom knives.

    AP-ST-BG-GG
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  7. Mission - MPK10-A2 Plain Edge - Navy Seal Knife - USED - Knife

    Knife withdrawn from private collection - Used, but overall in good condition - An iconic, iconic knife from the first decade of the 2000s, tested and selected by the U.S. Navy Seals - The knife already when new presented itself with an average low level of finish and with a rough micropeened blade already very delicate and marked, this knife, used in the field by an Italian soldier in theaters of war, shows signs of cosmetic wear on both blade and sheath that do not affect its functionality in the slightest - Factory sharpening still in excellent condition - Original amphibious scabbard, in very good condition - No box - Checked and certified by our in-house laboratory.

     


    Intended Use: Tactical / Multirole

    Type of Manufacture: industrial
    Blade: A2 steel hardened to 57/58HRC
    Country of Production: USA
    Handle: made of Hytrel
    Blade length: 140mm.
    Blade thickness: 6.3mm.
    Total length: 267mm.
    Weight: 360g.
    Sheath: amphibious, made of Hytrel
    Packaging: without original packaging
    Notes: used knife, withdrawn from private collection, overall in good condition

    MI-MPK10-A2
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  8. ExtremaRatio - Fulcrum Knife Compact Geocamo - PRIVATE COLLECTION - knife

    Knife withdrawn from private collection - Discontinued coloration - First series, with flat sheath - Overall in very good condition, with small marks on the blade due to insertion and removal of the knife from the sheath - Original factory sharpening in excellent condition, never used - Accompanied by original box and paper certificates and warranties - checked and certified by our in-house laboratory.


    Intended Use: Tactical/Sporting

    Production type: Industrial
    Country of Production: Italy
    Blade: stainless steel N690Co
    Finish: camouflage coating
    Handle: Forprene
    Blade length: 110mm.
    Blade thickness: 6.3mm.
    Total length: 210mm.
    Balance: backward
    Weight: 200g.
    Sheath: rigid ABS with Tek-Lok attachment with automatic knife retention system.
    Packaging: knife withdrawn from private collection globally in excellent condition

    ER-FUC-GEO-CP
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  9. ExtremaRatio - Col Moschin Black Fighting Knife - USED - knife

    Collected from a private collection - used, still in good condition, with worn blade and uneven burnishing - still with factory sharpening, but can be improved - accompanied by original sheath, in very good condition - no box and paper warranty certificates - checked and certified by our in-house laboratory

     

    Intended Use: Tactical / Military

    Country of manufacture: Italy
    Blade: stainless steel N690Co 58HRC
    Blade Finish: Burnishing MIL-C-13924
    Handle: detachable, made of Kraton
    Blade length: 160mm.
    Blade thickness: 6.3mm.
    Total length: 290mm.
    Balance: set back, 1 cm. from the lower guard branch
    Weight: 265g.
    Sheath: modular tactical, thigh or belt, made of Nylon
    Packaging: -
    Notes: used knife, withdrawn from a private collection, with signs of wear but overall in good condition

    ER-COL-BK-US
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  10. ExtremaRatio - Lamborghini Reventón knife - Limited Edition - PRIVATE COLLECTION - knife

    Reventon knife, no longer in production for years and limited to 2000 pieces, withdrawn from a private collection globally in excellent condition - Complete with everything, plastic box and certificates. Checked and certified by our internal laboratory.

    Extrema Ratio was chosen by Automobili Lamborghini to produce the Reventón Folder, an emergency knife, belt cutter and glass breaker, designed by the Lamborghini Style Center, which becomes the official equipment of each of the 20 Reventón produced, the most exclusive supercar of the House of Bull.

    The "Reventón Folder" is an accessory of the highest functional and aesthetic level, clearly in line with the philosophy of the car built with concepts and technologies directly borrowed from the most advanced aviation industry.

    The knife is produced in a limited edition of 2,000 pieces, the first twenty equip the Reventón, the other 1980 pieces will be available for collectors.

    Intended use: Collection

    Type of production: Industrial
    Production Lama: Italy
    Blade: N690Co 58HRC stainless steel
    Blade treatment: Testudo
    Handle: Anticorodal
    Blade length: 120mm.
    Blade thickness: 6.3mm.
    Closed length: 155mm.
    Total length: 260mm.
    Thick when closed: 21mm.
    Balancing: -
    Weight: 235g.
    Closure: Back Lock with safety catch
    Clip: -
    Sheath: -
    Packaging: plastic box with Lamborghini and Reventon logos
    Notes: Specimen number 297 out of 2000, unique piece at our disposal

    AP-REV-ER
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  11. ExtremaRatio - Landing Force Titanium - Italian Army Landing Troops - PRIVATE COLLECTION - knife

    Knife from private collection - Very rare knife from 2015, discontinued for several years, in min conditions - Comes with original packaging (box, protective plastics, manuals) and accessories (sheath and straps) - Never used, with original factory sharpening - Checked and certified by our in-house laboratory.

    Multi-role non-magnetic knife, developed and officially acquired by the landing troops of the Italian Army. Totally titanium blade and tang make the knife particularly resistant to oxidation and usable for magnetic trigger buried ordnance search (mine probing).


    Intended Use: Tactical / Military / Sub / Amphibious

    Production type: Industrial
    Country of Production: Italy
    Blade: Titanium Beta 40HRC
    Blade Finish: Burnishing
    Handle: Forprene
    Blade Length: 180mm.
    Blade thickness: 6.3mm.
    Total length: 310mm.
    Weight: 195g.
    Sheath: Desert nylon, with ABS hard shell; M.O.L.L.E. type thigh straps and attachments.
    Packaging: Cardboard box, certificates, manuals
    Notes: Widia glass breaker on rear tang.

    ER-LFT-CP
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  12. Wander Tactical - Prototype - PRIVATE COLLECTION - SanMai V-Toku2 & Desert Paracord - custom knife

    Absolutely like new - Comes from a private collection - Unique item made in 2020, prototype, does not correspond to any standard model of Wander Tactical production - Made entirely by hand.

     

    Use: Collection / Utility / Hunting

    Production type: Handcrafted
    Country of Production: Italy
    Blade: integral, japanese rolled steel (San Mai) with V-Toku2 (carbonaceous) cutting edge at 62/63HRC and SUS410 (stainless steel) outer cheeks
    Blade finish: satin finish 
    Handle: Paracord
    Blade length: 90mm.
    Blade thickness: 6.65mm.
    Total length: 200mm.
    Balance: backward
    Weight: 180g.
    Sheath: in kydex
    Package: Certificate of authenticity
    Notes: Unique piece of 2020 - Prototype: it doesn't correspond to any standard model of Wander Tactical production - Entirely hand made - Absolutely like new, coming from a private collection,

     

    Japanese steel merges with Italian excellence

    For this 2019/2020 collaboration, exclusive to Coltelleria Collini, we decided to propose a series of best sellers produced by Wander Tactical. Knives made with the famous San Mai steel produced by the Japanese Takefu Steel. Specifically we have used the carbonaceous V-Toku2 at 62/63HRC for the central plate and the stainless SUS410 for the two external plates, in order to guarantee a very high cutting capacity, penetration and edge holding together with an easy resharpening and maintenance. At the same time the blade has a remarkable resistance to corrosion and an important increase of resilience given by the type of extreme steel and the laminated structure.

    As in the ancient swords of the Japanese Samurai.

    The rolled steel - imported in Italy by Collini Steel directly from the Japanese Takefu Steel - is based on the ancient Japanese tradition in the creation of the famous Samurai swords. As early as 1100, expert Japanese blacksmiths combined different materials to give Katana swords incredible cutting capabilities combined with previously unknown strength and flexibility. It is thanks to this revolutionary construction technique that the Samurai swords have been preserved until our days becoming one of the most fascinating objects made by man. Following this tradition applied to modern metallurgy, we are now able to have technologically advanced steels already tested and used in cutlery by famous brands such as Fallkniven, Cold Steel, Mcusta, Kai, Sog, Zwilling, Rockstead, etc.

    Characteristics of San Mai steel: It is made of different types of metals alloyed together to create a composite that contains and intensifies the strengths of the metals taken individually:

    - Longer cutting edge life
    thanks to the use of high quality steels with a high carbon content (VG10, CoS, Shiro) or sintered (SPG2), in the core steel, the blade, once hardened, reaches hardness and cutting performance decidedly superior to those achieved with the use of traditional steels.

    - Greater resilience
    Built on the principle of Japanese swords, the multilayer steel is difficult to break thanks to the toughness of the central steel (Core Steel) and the elasticity of the steel used for the lateral coating (Stainless Steel).

    - Improved corrosion resistance
    The steel used for the outer layers (Stainless Steel) gives the blade a high resistance to corrosion. The combination of the two or more materials used by Takefu Steel generates, at a galvanic level, a structure that improves corrosion resistance even on the edge.

    - Easy machining even after heat treatment
    Although steel normally becomes harder after hardening, the lateral steel used in multilayer machining does not lose its softness and allows easy machining, drilling or welding even after heat treatment. For optimum blade performance, cryogenic treatment is recommended.

    - Improved aesthetic performance
    Knives made of multi-state steel or damascus pattern at the end of the processing are aesthetically elegant, refined and highly appreciated by collectors all over the world.

    For further information: collinisteel

    WT-PRO-VT
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  13. ExtremaRatio - Harpoon Miles knife - PRIVATE COLLECTION - knife

    Rare original model Extrema Ratio Harpoon Miles no longer in production since 2009 - Knife in excellent condition with original box and double handle. Checked, sharpened and certified by our internal laboratory - Collini Cutlery.

    Intended use: Tactical / Collection

    Type of production: Industrial
    Production Lama: Italy
    Blade: N690Co stainless steel
    Blade treatment: Miles
    Handle: double Forprene handle
    Blade length: 200mm.
    Blade thickness: 6.3mm.
    Total length: 340mm.
    Weight: 314g.
    Sheath: ballistic rubber
    Packaging: Cardboard box with Extrema Ratio logos
    Note: -

    ER-HAR-M-AP
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  14. ExtremaRatio - MPC knife Selected Shooters - knife

    Direttamente derivato da specifiche militari, questo chiudibile è stato sviluppato per sostituire nell'impiego un lama fissa.

    Per raggiungere questo risultato sono stati impiegati materiali robustissimi, alti spessori ed un sistema di apertura/chiusura solido e sicuro come il back lock.

    Il coltello dotato di sicura manuale che conferisce massima sicurezza nell'impiego e riduce in maniera drastica il rischio di chiusure accidentali.
    La sicura, se inserita in chiusura, evita agli operatori militari o di polizia che nel caso di sottrazione il coltello possa essere rivolto contro di loro.

    Materiali e lavorazioni:
    Tutte le parti del coltello sono ricavate dal pieno da macchine a controllo numerico ad alta precisione mentre l'assemblaggio, l'aggiustaggio e l'affilatura sono condotte artigianalmente.
    La lama in acciaio inossidabile al cobalto N690, un acciaio dalle elevatissime caratteristiche di resistenza alle sollecitazioni meccaniche, capacit di taglio, tenuta del filo e resistenza alla corrosione. L'arrotatura piana e la durezza di 58HRC.
    Le guancette dell'impugnatura sono in Anticorodal, una lega di alluminio con elevate doti di resistenza alle sollecitazioni meccaniche ed all'ossidazione.
    Il codolo, in N690 temprato, un efficace frangi cristalli d'emergenza. Tutta la viteria, i perni e la clip sono in acciaio inox brunito. La lama, la leva ed il codolo sono ricoperti con trattamento Testudo, molto resistente all'abrasione ed all'ossidazione. Le guancette sono anodizzate nere.

    Modello: M.P.C.
    Destinazione: Impiego generale
    Lung. Totale: 260 mm
    Lama: 115 mm
    Peso: 245 gr
    Spess. Lama: 6 mm
    Mat. Lama: Acciaio inox al cobalto N690
    Impugnatura: Anticorodal

    4147
    €0.00
    Only -99 left
    Only -99 left
    Out of stock
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