How To Yes, it’s here: The Opinel dating chart

[Falcata]

I'm sharing this classic chart from fpanda for those trying to date their knives. Like many of you, I check it from time to time, but I always forget where to find it...

Une Collection d'Opinel

Une collection de couteaux Opinel : historiques et customs

fpanda.free.fr

This chart is essential for identifying tang stamps, Virobloc variations, and dating vintage Opinels from the early 1900s to the 2000s.

Quick tip for dating your Opinel: Check the Virobloc (Safety Ring).

• Pre-1955: No safety ring at all.
• 1955 - 2000: The Virobloc was invented in 1955 by Marcel Opinel, but it only locked the blade in the open position. Early virobloc 1955-1966, no stainless steel blade, see tag blade and shell (opinel, Number, breveté or breveté SGDG). Virobloc 1967- 1985 no stainless steel blade and see the tag blade.
• 1998: the locking ring is redesigned to introduce locking in the closed position. Many manufacturers would take advantage of the expiration of the first Virobloc patent to create their own versions.
• Post-2000: The ring was modified to lock the blade in both the open and closed positions. From the No. 6 model upwards, the Virobloc safety system became mandatory.

If your knife has a safety ring but won't lock while closed, you know it's a 'vintage' piece from that 45-year window between 1955 and 1999.


A quick breakdown of the fpanda website:

The museum (highly recommended)

Musée

Standard models

Courants

The Different Series

Séries

The clones

Clones

OTHER RESOURCES... ​

Sizes and weights

Price guide to Opinel knives made of natural wood

Cote / Value Opinel

Cotes des couteaux Opinel en bois naturel / Price guide to Opinel knives made of natural wood

coteopinel.pages-perso.free.fr

Prices are for guidance only (check current prices)

 

[Mens Abdita]

Thanks for this - all of my Opinels are from this century, but the chart will come in handy depending on what I encounter.

 

[Falcata]

Thanks for this - all of my Opinels are from this century, but the chart will come in handy depending on what I encounter.

Seek and you shall find

 

[Franciscomv]

Cheers for the info!

My folding Opinels were all made after 1990 or so, but I do have some older fixed blades.

 

[jfk1110]

Very cool thanx for sharing this...

 

[Alex.Y.]

Wow, thank you for sharing! I especially love the ole html-construction website.

One thing. I think traditional Austrian knife - Trattenbacher - is an independent creation, not an intended Opinel "clone". Am I wrong?

 

[Falcata]

Wow, thank you for sharing! I especially love the ole html-construction website.

One thing. I think traditional Austrian knife - Trattenbacher - is an independent creation, not an intended Opinel "clone". Am I wrong?
View attachment 3154309

I like it. They don't think so but I think so. That type of ferrule dates back to the 19th century, and who knows where it actually originated (it's a simple friction mechanism).This is a French clone from Thiers...

I think yours only has the ferrule in common. Does giving this type of ferrule a conical shape make it a clone?". Mine took advantage of Opinel's Virobloc change and patent issues to be manufactured. In Europe, they have always copied each other.
I have a traditional Italian knife with this ferrule, but it isn't a clone. The original design is from the 19th century:

And this same brand has a blatant copy in the photo on the French website (the last one in the bottom photo). What Opinel purists think is another story... That's how they consider it on the fpanda website. If someone shows me a 19th-century patent, I'll shut my mouth.

 

[Falcata]

An early virobloc... 1955-1967. It arrived today.

Opinel, number, virobloc, BREVETE with/without SGDG (Are the ones that have both the early ones and the most sought-after?). To be sure that your Opinel is from between 1955 and 1967, the most reliable way is to check the blade stamp (blade design changed in 1968).

No lock when the blade is folded.

Too bad I can't find this ad for the No. 7, just to see what it said on the collar...

 

[Henry Beige]

Thanks for posting that. I always have to go hunting for it. For my money, the most desirable Opinels are pre-2000, precisely because they lack the closing lock.

 

[Falcata]

Thanks for posting that. I always have to go hunting for it. For my money, the most desirable Opinels are pre-2000, precisely because they lack the closing lock.

I use the chart above to go hunting for them. This one was the jackpot. It's curious that all the oldest ones I've bought have been from Italian sellers.

 

[El Jay]

Thanks for posting this chart. I'm carrying a year old #8 carbone today. Cuts like a dream.

 

[Falcata]

A Curious Fact. The Virobloc and its patents: Documented Chronology of the early Virobloc (Source: Espacenet)

1. Patent FR1071530 (A)
Priority Date: February 27, 1953
Publication Date: September 1, 1954
Title: Cran d'arrêt (rotating ring?)
Inventors: Marcel Opinel and Léon Opinel
Description: This document represents the initial development of the folding knife
concept featuring a safety system.

2. Patent FR1142967 (A)
Priority Date: May 16, 1955
Publication Date: September 25, 1957
Title: Couteau pliant (Folding Knife)
Inventor: Maurice-Henri-Jean Opinel
Description: This is the primary patent associated with the Virobloc as it is historically recognized.

3. Patent FR68792 (E)
Priority Date: December 29, 1955
Publication Date: June 10, 1958
Description: This corresponds to a certificate of addition or related improvement.


This indicates that the Virobloc was not a single event in 1955, but rather a development process and a family effort:

1953: first patented concept.
1955: redesign or final version.
1957: publication of the main patent.
1958: complementary improvements.

Why do we find the words 'Breveté' and 'Breveté SGDG' on the locking rings of these early Viroblocs?

My own theory: This is due to a French regulation dating back to the 19th century (1844, source) . In theory, products patented in France were required to carry the 'Breveté SGDG' mark throughout the life of the patent.

Breveté SGDG (Patented without government guarantee)

Although this rule was abolished in 1968, Opinel had already simplified it to just 'Breveté' during the 1960s ( rules are made to be circumvented or... foreign markets?). This explains the rarity of the pieces that feature both terms on the ring. It is also true that, on certain knife sizes, it was physically difficult to include the full text.

The mystery lies between these two factors. And I’m siding with 'size does matter here'.

 

[Falcata]

How to remove the outer Virobloc ring easily...

 

[Falcata]

Opiflex néo6... Is this the end of the Virobloc? Is this 'invention' the next step forward or a commercial maneuver? This post is strictly informational, not promotional.

What is this new Opinel system like and how does it work? Néo6 is a pocket knife with a 7 cm blade made of European martensitic stainless steel with a hardness of 55-57 HRC (Sweden?). The closed length is 9.5 cm and it weighs 25 g. It's more or less like a traditional Opinel No. 6, but with a rounded tip.

And what does the mechanism look like inside? It is a retention system, not a locking system...

The geometry of the blade tang exerts constant pressure against the internal spring, securing the blade in both the open and closed positions. Given its compact length, hopefully its long-term resistance to metal fatigue and permanent deformation will hold up, though I assume Opinel has thoroughly stress-tested the design.

Last two photos from forum members.
(Source)

The Opinel Néo6 Opiflex is targeted at the international urban market and countries with strict knife laws like the UK, as its non-locking retention system makes it 100% "legal" for EDC. Featuring a refined design in premium woods and a rounded tip that reduces visual intimidation.
Call me old-fashioned, but I'll stick with the classic Virobloc.

 

[Falcata]

Product Overview: Asimocrafts Asigrip OP (Opinel Custom Set)​

The Asigrip OP is a premium, artisan-made handle replacement kit for Opinel knives, primarily developed by the Japanese boutique outdoor brand Asimocrafts (often in collaboration with Neru Design Works). It is a staple in the high-end Japanese "outdoor gear" scene. Love it or hate it .

• Design & Aesthetics: Unlike the standard mass-produced beechwood Opinel handle, the Asigrip OP is crafted from high-quality hardwoods (such as Oak). It features a sophisticated (or not), ergonomic design with specialized textures and geometries, transforming a functional tool into a premium collectible piece.

• Production: These kits are manufactured in small-batch runs. Their scarcity and "handmade" nature make them highly sought-after in the global camping and bushcraft community.

• Installation: This is a DIY component. It requires disassembling the factory-standard Opinel (removing the collar/Virobloc and the pivot pin) to transplant the blade into the new custom handle.

• Collectability: Highly valued in the secondary market (often commanding high prices in Japan and international enthusiast circles). It is widely regarded as the "pinnacle" of custom Opinel modifications.

 

[Falcata]

It’s a miracle! I’ve managed to get one of the first Virobloc models in near-NOS condition!

 

[Falcata]

I like it. They don't think so but I think so. That type of ferrule dates back to the 19th century, and who knows where it actually originated (it's a simple friction mechanism).This is a French clone from Thiers...

I think yours only has the ferrule in common. Does giving this type of ferrule a conical shape make it a clone?". Mine took advantage of Opinel's Virobloc change and patent issues to be manufactured. In Europe, they have always copied each other.
I have a traditional Italian knife with this ferrule, but it isn't a clone. The original design is from the 19th century:

And this same brand has a blatant copy in the photo on the French website (the last one in the bottom photo). What Opinel purists think is another story... That's how they consider it on the fpanda website. If someone shows me a 19th-century patent, I'll shut my mouth.

The mother of many traditional European folding pocket knives...

Arguing whether an Austrian pocket knife (Tratterbacher) is a copy of an Opinel is nonsense: no, both are copies or evolutions of the French "Eustache", which in turn derives from a Roman model (actually, they are Hispanoroman...).

The rediscovery and evolution of these Roman ones were very successful in Spain during the Muslim rule and after the Christian Reconquista. In fact, the official date of the folding pocket knife's creation is the 16th century, in Spain. The Eustache model could have originated in the 17th century.

Pocket knife handle scales found in excavations at the Roman villa of La Olmeda (Pedrosa de la Vega, Palencia, Spain).

The French "Eustache" (Eustace, Late 17th century?) knife was already known in the 18th century and was the first popular, quality mass-produced folding knife: it was the Opinel of the 19th century, and, in fact, the Opinel is essentially an Eustache in disguise.

It did not originate from Thiers, but from Saint-Étienne, although it was later manufactured in Thiers as well, which leads to the typical rivalry between cities that exists even today. Regarding the common belief about its origin: it was not invented in 1782 by the Parisian cutlery seller Eustache Dubois; rather, he was the one who popularized it in Paris.

Eustache from 1739. Photo from the book "The Madness of Pocket Knives" (La follie des couteaux de poche) by Dominique Pascal. Flammarion Publishing.

The Eustache type was also widely sold in Spain, its Overseas provinces (especially Argentina and Mexico), and Italy under the manufacturer's name, "Bizalion." After 200 years, brands like Opinel took over and this knife gradually faded into oblivion.

What did the Eustache contribute to knife design? The ferrule and a single pivot pin in a one-piece handke, linerless. Building a sturdier and more economical knife with only those three components is impossible.

 

[Falcata]

Seen on Reddit, I think it's from between 1909 and 1935...