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The Eustache was first made in 1789, year of the French revolution, by Eustache Benoit, a cutler from Saint Etienne.
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It’s a friction folder, the slipjoints were not very common yet. The blade has no locking system, only the tighness of the pivot keeps it open.
It has a typical and very pronounced clip point blade.
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The handle is made of a single piece of wood (like an Opinel or a Montpellier) with a long metallic sleeve, sort of bolster, covering around 2/3 of the handle.
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The end of the handle has the shape of a boot, a bit like a jambette knife, to accommodate the tip once folded.
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The cheapest versions had the wood blackened in a hot mold.
The knife is rather large per today’s standard and was popular at the time.
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It is mentioned in the chronicles “The Mysteries of Paris” by Eugene Sue in 1842. The name even became a generic term for a knife in French slang.
I fell into oblivion with the advent of the slipjoints by the mid Nineteenth century but was revived for the celebrations of the 200 years of the French revolution.
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Today, Thiers Issard is using some old stock and is making a re-edition true to the original shape and size with a boxwood handle and a sleeve engraved with a French revolution theme.
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A real piece of history, testament of what was a folding knife some 235 years ago!
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Find some on https://knives-of-france.com/