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1 Centime pattern in tin, Gengembre process
| Issuer | France |
|---|---|
| Year | 1796 |
| Type | Log in to see details |
| Value | Log in to see details |
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| Composition | Log in to see details |
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| Diameter | Log in to see details |
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| Orientation | Variable alignment ↺ |
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| Obverse description | Log in to see details |
|---|---|
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| Obverse lettering | LIBERTÉ - L`AN CINQ |
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| Reverse script | Latin |
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| Additional information |
The Gengembre process was an experimental coinage method proposed in the mid-1790s as the Directory government struggled to stabilize a monetary system wrecked by the assignat collapse. Jean-Baptiste Gengembre's technique involved striking on tin planchets under modified pressure conditions, and the Monnaie de Paris produced a small series of pattern pieces to test its viability. The process was never adopted for circulation.
Tin was a poor long-term choice — too soft, too prone to oxidation — and that practical rejection is precisely why surviving examples are so seldom encountered outside institutional collections.