Approved - knives withdrawn from private collections, checked, overhauled and certified by Coltelleria Collini

PREVIOUSLY PURCHASED KNIFE, FROM A PRIVATE COLLECTION
* Origin: Acquired from a private seller, previously purchased
* Condition: Overall in excellent condition
* Availability on the market: Hard to find
* Sharpening: Factory-sharpened
* Marks on blade: A few small abrasions visible against the light on the mirror finish
* Marks on handle: None
* Box: Present and complete
* Sheath: /
* Manuals, Certificates, and Warranties: Present
* Inspected and Certified by our in-house laboratory

The Rockstead HIGO II in titanium is not simply a high-end folding knife: it is the ultimate embodiment of Japanese philosophy applied to cutting, where every detail is pushed to the limits of perfection.

The minimalist, flawless titanium handle serves as a counterpoint to a ZDP-189 blade hardened to extreme hardness and finished with an almost unreal mirror polish. The result is not merely aesthetic: it is a living surface, capable of gliding through material with a smoothness and continuity that few knives in the world can offer.

Rockstead’s proprietary convex geometry does more than just cut: it separates, controls, and guides. It is a blade designed for those who recognize the difference between extreme sharpness and true long-term efficiency.

The HIGO II is an object for connoisseurs, where tolerances, treatments, and finishes are not mere technical specifications, but part of a precise language.

Intended use: Collectible / Sport

Production type: Midtech
Country of manufacture: Sakai - Japan
Blade: ZDP-189 stainless steel, hardened to 66.5 HRC
Blade finish: mirror polished
Handle: titanium
Blade length: 90mm.
Blade thickness: 3mm.
Closed length: 120mm.
Total length: 216mm.
Closed thickness: 12.2mm.
Weight: 136g.
Opening mechanism: ambidextrous pivot 
Washers: brass
Closure: FrameLock with SKD11 striker at 61HRC
Clip: removable, 420J2 stainless steel with PVD coating
Packaging: Wooden box with Rockstead logos, certificate with serial number and steel hardness test
Notes: knife from a private collection, previously purchased

KNIFE WITHDRAWN FROM PRIVATE COLLECTION
* Type: previously purchased
* Condition: in perfect mechanical condition, aesthetically shows some abrasion and signs of wear due to the passage of time
* Available on the market: iconic model from the early 2000s, now out of production
* Sharpness: Factory sharpness, could be improved
* Marks on blade: some minor abrasions due to age
* Marks on handle: cosmetic abrasions due to age
* Box: -
* Manuals, certificates, and warranties: -
* Checked and certified by our in-house laboratory

Directly derived from military specifications, this folding knife is designed to replace a fixed blade in the most demanding operational situations. To ensure maximum reliability, extremely robust materials, increased thicknesses, and a solid and secure back lock opening/closing system have been used.

A manual safety lock ensures maximum protection during use, drastically reducing the risk of accidental closure. When inserted in the closed position, it also prevents the knife from being immediately used against the operator in the event of theft.

Materials and workmanship
All components are machined from solid blocks using high-precision CNC machines, while assembly, adjustment, and sharpening are carried out by hand. The blade is made of N690 cobalt stainless steel, known for its high mechanical strength, great cutting ability, edge retention, and excellent corrosion resistance. It has a flat grind and a hardness of 58 HRC.

The scales are made of Anticorodal, an aluminum alloy that is highly resistant to stress and oxidation. The tang, made of hardened N690, acts as an effective emergency glass breaker. Screws, pins, and clips are made of burnished stainless steel, while the blade, lever, and tang are protected by Testudo treatment, which is highly resistant to abrasion and oxidation. The scales are black anodized.

Intended use: tactical/military

Blade: N690Co 58HRC stainless steel with burnished “testudo” finish
Country of manufacture: Italy
Blade length: 95mm.
Blade thickness: 6.3mm.
Closed length: 127mm.
Total length: 220mm.
Handle: Anticorodal, 4.5mm thick
Weight: 200g.
Closure: Back Lock with additional safety system, also functioning when the blade is closed
Clip: removable and reversible, stainless steel
Sheath: -
Notes: previously purchased knife from a private collection

KNIFE WITHDRAWN FROM PRIVATE COLLECTION
* Type: Previously purchased, from a private collection.
* Condition: in good condition
* Commercially available: discontinued and no longer available.
* Sharpening: Factory sharpened, improvable
* Marks on blade: Small marks near the edge, due to time and use.
* Marks on handle: Small marks from time and use - Hardware and clip show discoloration
* Box: Absent
* Manuals, Certificates and Warranties: Absent
* Checked and Certified by our in-house laboratory.

MF stands for Medium Folder. This line of knives fits in between the Basic Folders series and the Heavy Folders series. The typical mechanism of the series is the LINER-LOCK. The overall structure is sturdy.

All knives in the MF series have a rear glass breaker. They also feature the innovation of the adjusting counterscrew at the blade attachment stud. By removing the counterscrew, the center pin can be tightened or loosened at will, so as to achieve the desired smoothness of opening. It will be sufficient to re-lock the pivot screw with the counterscrew to secure the adjustment.

The BC (Belt Cutter) version features the rear belt cutter with an easily available and replaceable industrial cutter blade. In addition, a slotted screwdriver is inserted inside the grip to allow adjustment and calibration of firearm optics. 

Intended Use: Tactical/Emergency

Production Type: Industrial
Country of manufacture: Italy
Blade: Stainless steel N690Co 58HRC
Blade Finish: Burnishing
Handle: Anticorodal 
Blade length: 95mm.
Blade thickness: 4mm.
Length closed: 134mm.
Total length: 225mm.
Thickness when closed: 24mm.
Weight: 162g.
Closure: Liner Lock with additional safety catch
Clip: burnished stainless steel, deep pocket, removable and reversible
Notes: belt cutter, glass breaker, optics screwdriver - previously purchased knife from a private collection

Type: Previously Purchased
Condition: in excellent condition
Available in the market, currently in production
Sharpening: Factory standard
Blade marks: None
Handle marks: None
Box: Present
Sheath: Not applicable
Manuals, Certificates, and Warranties: ER
Checked and Certified by our internal laboratory
Intended use: Tactical/Emergency

Type of production: Industrial
Blade Production: Italy
Blade: N690Co stainless steel, 58HRC
Blade Treatment: Testudo
Handle: Anticorodal
Blade length: 95mm
Blade thickness: 4mm
Closed length: 134mm
Total length: 225mm
Closed thickness: 24mm
Balance: Not applicable
Weight: 162g
Closure: Liner Lock
Clip: Stainless Steel
Sheath: Not applicable
Packaging: black cardboard box with Extrema Ratio logos
Notes: seat belt cutter, glass breaker, screwdriver for optics

KNIFE WITHDRAWN FROM PRIVATE COLLECTION
* Type: Previously Purchased
* Condition: In very good condition
* Commercially available Discontinued
* Sharpening: Factory
* Marks on blade: -
* Marks on handle: - -
* Box: marketed in silk pouch.
* Scabbard: Leather, belt, original, with a few small marks given by time.
* Manuals, Certificates and Warranties: present.
* Checked and Certified by our in-house laboratory



The HIGO-MH-DLC folder features a 3.5-inch YXR7 blade with DLC coating and Micarta handle. The incredible mirror finish is achieved by heat treating the blade and gradually grinding by hand with wet and dry sandpaper of 400, 600, 800, 1,200 and 2,000. The HIGO-MH-DLC comes with a black leather belt case with a slot to hold the included torx wrench.

Country of manufacture: Japan
Type of manufacture: midtech
Blade: DLT571 steel (Hitachi YXR7 at 64.1HRC with 3micron HPC coating and hardness of Hv1300)
Handle: 2mm stainless steel sus402J2 at 52HRC with micarta handles
Blade length: 90mm.
Blade thickness: 3.5mm.
Total length: 216mm.
Weight: 139g.
Closure: Liner Lock
Clip: stainless steel
Notes: Serial number 303 - 2010 knife accompanied by warranty certificate with technical specifications - Model discontinued and no longer commercially available

KNIFE WITHDRAWN FROM PRIVATE COLLECTION
* Type: Previously Purchased
* Condition: Like new
* 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.


The best industrial knives currently in production are marketed under the Rockstead brand. Created by Katsumi Kitano, who has been making quality knives for more than 20 years to the extent that he has been awarded the highest distinction among artisan knife makers in Japan, they prove to be exceptional both in cutting ability, penetration and edge-holding and in the level of innovation for the materials used and construction techniques.

Country of production: Japan
Type of production: midtech
Blade: Hitachi YXR7 steel at 64.8HRC with 3micron HPC coverage and hardness of Hv1800
Handle: Duralumin A2024 with surface anodizing and hardness of Hv400
Blade length: 90mm.
Blade thickness: 3.5mm.
Total length: 215mm.
Weight: 130g.
Closure: Frame Lock with SKD11 casement at 61HRC
Clip: made of 402J2 steel at 48HRC
Notes: Serial number 005 - 2010 knife accompanied by warranty certificate with technical specifications - Model discontinued and no longer commercially available