
Details
WITHDRAWN FROM A PRIVATE COLLECTION
- Type: Previously Purchased
- Condition: In excellent condition
- Market Availability: First version with leather sheath
- Factory Sharpened: Yes
- Blade Marks: None
- Handle Marks: None
- Packaging: Complete, cardboard box with manufacturer logos
- Sheath: Leather
- Manuals, Certificates, and Warranties: Warranty certificates
- Checked and Certified: By our internal laboratory
Intended Use: Roasting
- Production Type: Industrial
- Blade Production: Italy
- Blade: N690Co stainless steel, hardened to 58HRC
- Blade Treatment: Satin finish
- Handle: Forprene
- Blade Length: 300mm
- Blade Thickness: 6.5mm at the handle, 4mm on the blade
- Total Length: 433mm
- Weight: 336g
- Sheath: Black leather
- Packaging: Cardboard box with Extrema Ratio logos
- Note: Also suitable as a sports or collectible knife
Extrema Ratio has applied its rigorous military standards to a series of professional kitchen knives.
The blade is made of tested BOHLER N690 steel, enriched with chromium, vanadium, molybdenum, and cobalt, hardened to 58HRC. The handle is made of Forprene, an elastomer that meets NATO standards for resistance to extreme conditions and is fully removable from the blade, allowing for thorough cleaning and maintenance.
Each knife comes with its own sheath, also derived from military equipment. While not designed to meet hygiene regulations, it ensures safe transport of the extremely sharp blade and protects it from impacts that could reduce its efficiency. We recommend using the sheath only for transportation and long-term storage.
Extrema Ratio – Made in Italy Tactical Excellence
Extrema Ratio is an international reference in professional tactical cutlery, official supplier to the Italian and French Armed Forces (NATO Code AD856). Every knife is designed for real operational use: selected materials, advanced treatments, and artisanal finishes guarantee robustness, precision, and reliability in all conditions.
Coltelleria Collini Guarantee: We have been a historic official Extrema Ratio dealer for over 25 years. We offer dedicated support, immediate availability, previews, and a catalog always updated with all the latest productions.
➡ Discover Extrema Ratio history, models, and news on our dedicated page
Extrema Ratio - Waki Knife 30cm. - N690 - PRIVATE COLLECTION - Collectible Knife
Details
WITHDRAWN FROM A PRIVATE COLLECTION
- Type: Previously Purchased
- Condition: In excellent condition
- Market Availability: First version with leather sheath
- Factory Sharpened: Yes
- Blade Marks: None
- Handle Marks: None
- Packaging: Complete, cardboard box with manufacturer logos
- Sheath: Leather
- Manuals, Certificates, and Warranties: Warranty certificates
- Checked and Certified: By our internal laboratory
Intended Use: Roasting
- Production Type: Industrial
- Blade Production: Italy
- Blade: N690Co stainless steel, hardened to 58HRC
- Blade Treatment: Satin finish
- Handle: Forprene
- Blade Length: 300mm
- Blade Thickness: 6.5mm at the handle, 4mm on the blade
- Total Length: 433mm
- Weight: 336g
- Sheath: Black leather
- Packaging: Cardboard box with Extrema Ratio logos
- Note: Also suitable as a sports or collectible knife
Extrema Ratio has applied its rigorous military standards to a series of professional kitchen knives.
The blade is made of tested BOHLER N690 steel, enriched with chromium, vanadium, molybdenum, and cobalt, hardened to 58HRC. The handle is made of Forprene, an elastomer that meets NATO standards for resistance to extreme conditions and is fully removable from the blade, allowing for thorough cleaning and maintenance.
Each knife comes with its own sheath, also derived from military equipment. While not designed to meet hygiene regulations, it ensures safe transport of the extremely sharp blade and protects it from impacts that could reduce its efficiency. We recommend using the sheath only for transportation and long-term storage.
Extrema Ratio – Made in Italy Tactical Excellence
Extrema Ratio is an international reference in professional tactical cutlery, official supplier to the Italian and French Armed Forces (NATO Code AD856). Every knife is designed for real operational use: selected materials, advanced treatments, and artisanal finishes guarantee robustness, precision, and reliability in all conditions.
Coltelleria Collini Guarantee: We have been a historic official Extrema Ratio dealer for over 25 years. We offer dedicated support, immediate availability, previews, and a catalog always updated with all the latest productions.
➡ Discover Extrema Ratio history, models, and news on our dedicated page
Specifications
| Brand | Extrema Ratio |
|---|---|
| Manufacturer information | Extrema Ratio S.R.L. Via Traversa delle Ripalte,72/78 59100 Prato Italy https://extremaratio.com |
| Country of production | Italy |
| Blade Type | Fixed |
| Blade Length | 25/30cm |
| Edge | Plain |
| Blade Tip | Tanto |
| Blade thickness | 4 mm |
| Blade Finish | None (Satin / Stonewashed) |
| Stainless Steel | N690Co |
| Handle Material | Synthetic |
| colour | black |
| Locking Type | / |
| Materials and Finishes | 7,5 |
| Steel Quality | 7,5 |
| Strength | 7 |
| Practicality | 8 |
| Aesthetic | 7 |
| Quality/Price | 7 |
| Downloadable Catalog |





























