Sport, Military and Collectible Knives | Coltelleria Collini
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Extremaratio - RAO C Outdoor - Folding Knife - n690 - Heavy Duty Outdoor
The RAO C Outdoor is a heavy-duty folding knife designed by Extrema Ratio to ensure maximum strength, reliability and field versatility.
Derived from the renowned RAO II, this version keeps the solid RAO C structure while adopting features tailored to outdoor tasks. It includes a Böhler N690 stone washed blade, green cerakote aluminum handle, and a dual locking system for extra safety under heavy use.
Designed for advanced camping, operational bushcraft and demanding fieldwork, it offers an excellent balance of control, portability and consistent performance in natural settings.
Technical specs:
Intended use: advanced outdoor - bushcraft - operational camping
Country of origin: Made in Italy
Blade: Böhler N690 steel (58 HRC) – high corrosion resistance and edge stability
Blade finish: stone washed (reduced marks, easy maintenance)
Blade grind: flat
Handle: anodized Anticorodal aluminum with cerakote + dual steel frame
Blade length: 100 mm
Blade thickness: 4 mm
Overall length: 225 mm
Weight: approx. 236 g (Outdoor version)
Locking system: bar & pin lock with dual safety
Clip/Sheath: steel clip + Kydex sheath
Packaging: Extrema Ratio branded box, laser-cut RAO C gadget, outdoor Kydex sheath
Note: green handle with high-visibility paracord for fast retrievalER-RAO-C-O -
ExtremaRatio - RAO C - N690Co & Aluminum Tactical Grey - folding knife
Thanks to its structure, RAO C is a tool that despite its small size, manages to guarantee the same qualities of robustness and reliability as its big brother while offering better portability and manageability.
The locking mechanism on opening is particularly strong as it is assisted by a safety system that turns it into a true fixed blade. The primary safety on the blade is activated by raising and lowering the locking pin. To provide the user with maximum safety in use, a practical and quick secondary safety has been applied, which can be activated simply by moving the locking pin horizontally.
For the purpose of lightening the steel frames, a template was laser-cut from the profile of the RAO C, which was then used to make a gadget that is delivered with the knife.
Intended use: hiking/tactical
Type of production: industrial
Country of production: Italy
Blade: stainless steel N690Co 58HRC
Blade Finish: Burnishing MIL-C-13924
Handle: anticorodal anodized with hard oxidation
Blade length: 100mm.
Blade thickness: 4mm.
Length closed: 132mm.
Total length: 225mm.
Weight: 239g.
Closure: modified front lock, with push-button aditional safety.
Notes: keychain gadget, with miniature profile of the knifeER-RAOC-TG -
ExtremaRatio - RAO C - N690Co & Aluminum Black - folding knife
Thanks to its structure, RAO C is a tool that despite its small size, manages to guarantee the same qualities of robustness and reliability as its big brother while offering better portability and manageability.
The locking mechanism on opening is particularly strong as it is assisted by a safety system that turns it into a true fixed blade. The primary safety on the blade is activated by raising and lowering the locking pin. To provide the user with maximum safety in use, a practical and quick secondary safety has been applied, which can be activated simply by moving the locking pin horizontally.
For the purpose of lightening the steel frames, a template was laser-cut from the profile of the RAO C, which was then used to make a gadget that is delivered with the knife.
Intended use: hiking/tactical
Type of production: industrial
Country of production: Italy
Blade: stainless steel N690Co 58HRC
Blade Finish: Burnishing MIL-C-13924
Handle: anticorodal anodized with hard oxidation
Blade length: 100mm.
Blade thickness: 4mm.
Length closed: 132mm.
Total length: 225mm.
Weight: 239g.
Closure: modified front lock, with push-button aditional safety.
Notes: keychain gadget, with miniature profile of the knifeER-RAOC-BK -
ExtremaRatio - RAO II Expeditions - knife
Intended use: hiking / Survivalism
Type of production: industrial
Country of manufacture: Italy
Blade: stainless steel N690Co 58HRC
Blade treatment: Dark Stone
Handle: anticorodal of 4.5mm
Blade length: 115mm.
Blade thickness: 6.3mm.
Length closed: 142
Total length: 262mm.
Weight: 330g.
Closure: modified front lock - threaded safety pin
Sheath: tactical Nylon with M.O.L.L.E. attachments suitable for both closed and open knife
Notes: diamond sharpener and fire starter includedER-RAO-II-EX -
ExtremaRatio - RAO II - knife
Intended use: military / tactical
Type of production: industrial
Production Blade: Italy
Blade: Stainless steel 58HRC N690Co
Treatment Blade: Testudo MIL-C-13924
Handle: 4.5mm anti-corrosion
Blade length: 115mm.
Blade Thickness: 6.3mm.
Length closed: 142
Overall length: 262mm.
Balancing: -
Weight: 330g.
Closure: front lock changed - safety pin threaded
Clip: -
Sheath: tactical nylon with attacks M.O.L.L.E. suitable for both the knife closed and open
Notes: diamond sharpener includedER-RAO-II -
ExtremaRatio - RAO C Folding Knife - Tactical Grey - PRIVATE COLLECTION - knife
PREVIOUSLY PURCHASED KNIFE, FROM A PRIVATE COLLECTION
* Origin: Acquired from a private seller, previously purchased
* Condition: Overall in excellent condition; opened and closed only a handful of times; never used for cutting
* Available on the market: Available
* Sharpening: Factory-sharpened
* Marks on blade: None
* Marks on handle: Minor marks on the handle’s anodized finish, near the release pins
* Box: Present and complete
* Sheath: /
* Manuals, Certificates, and Warranties: Present
* Inspected and Certified by our in-house laboratoryThe Extrema Ratio RAO C is a compact folding knife derived from the iconic RAO II.
Thanks to its design, the RAO C is a tool that, despite its small size, manages to guarantee the same robustness and reliability as its larger counterpart while offering improved portability and handling.
The handle consists of two finely crafted anodized aluminum scales, to which Extrema Ratio applies a hard-anodizing treatment, making the handle more resistant to wear and corrosion.
Two steel frames help increase the handle’s sturdiness to withstand the most demanding uses.
The opening lock mechanism is particularly durable, as it is supplemented by a safety system that transforms it into a true fixed blade. The primary safety on the blade is activated by lifting and lowering the locking pin. To ensure maximum safety for the user, a practical and quick secondary safety has been added, which can be activated simply by moving the locking pin horizontally.
The reversible clip is designed to allow for concealed carry in a pocket, making the knife invisible from the outside.
The blade is made of Böhler N690 steel, hardened to 58 HRC, with the classic Extrema Ratio MIL-C-13924 black finish.
To lighten the steel frames, a laser-cut template based on the RAO C profile was created, which was then used to make a gadget included with the knife.
Intended use: Hiking / Tactical
Production type: industrial
Country of manufacture: Italy
Blade: N690Co stainless steel 58HRC
Blade finish: MIL-C-13924 burnishing
Handle: hard-anodized anticorodal
Blade length: 100mm.
Blade thickness: 4mm.
Closed length: 132mm.
Overall length: 225mm.
Weight: 239g.
Closure: Modified front lock, with additional push-button safety
Notes: Keychain gadget, featuring a miniature profile of the knife—a previously purchased knife from a private collectionER-RAOC-TG-CP -
Chris Reeve - Ti-Lock Stone Washed - NOS Full Set - PRIVATE COLLECTION - folding knife
NOS FULL SET KNIFE, NEW FROM STOCK
* Type: 2001 NOS new old stock - New from stock.
* Condition: Like new, never taken out of original packaging.
* Commercially available Out of production
* Sharpening: Factory
* Marks on blade: No
* Marks on handle: No
* Box: Present
* Scabbard: -
* Manuals, Certificates and Warranties: Present
* Checked and Certified by our in-house laboratory.
The Ti-Lock mechanism was originally designed to isolate the locking mechanism from the handle of the knife so that it can offer greater freedom of design. Totally ambidextrous, the Ti-Lock is not meant to be a mere exercise in style, but should be understood as a mechanical innovation and a solid and reliable testament to the passion of Chris Reeve and Grant and Gavin Hawk.
Intended Use: Sporting/Collection
Type of production: Semi-manufactured
Country of Production: USA
Blade: CPM-S35VN 58/59HRC stainless steel
Blade Treatment: Stonewashed
Handle: Titanium 6AI4V Stone Washed
Blade Length: 82.5mm.
Blade Thickness: 3.2mm.
Length closed: 100mm.
Total length: 182.5mm.
Weight: 85g.
Closure: Ti-Lock titanium 6AI4V
Clip: Titanium 6AI4V
Packaging: Cardboard box with Chris Reeve logos, certificates
Notes: Design by Grant and Gavin Hawk - NOS knife, new from stock - Includes box and certificatesCR-TILSW-CP -
Spyderco - Ouroboros by Paul Alexander - C207G - knife
Intended use: Utility / Hunting
Type of production: Industrial
Country of production: Seki - Japan
Blade: Stainless Steel VG-10
Blade treatment: Satin finish
Handle: G10 liners with embedded stainless steel
Blade length: 72mm.
Blade thickness: 2.5mm.
Closed Length: 106mm.
Overall length: 175mm.
Thick when closed: 10mm.
Weight: 102g.
Closure: Front Lock
Clip: reversible, stainless steel
Packaging: cardboard box with Spyderco logos
Notes: Design by Paul AlexanderSC207G















