qsy-complains-a-lot:

Lepage civilian Mle1855 pistol

Designed at the Manufactures d’Armes de St-Etienne and Châtellerault c.1855, civilian copy manufactured by Gilles M. L. Moutier-Le Page of the Lepage household name.
.69 caliber, twin over-under damascus-pattern barrels, percussion lock.

While we can debate the wisdom of French procurement when they decided to issue double-shot dueling pistols to the general staff, there’s no denying that the copies of said gun were a big hit on the civilian market. This particular example is notable in that it uses Lepage’s system featuring a single trigger releasing one hammer at a time consecutively, which is not present on the military model and was exceedingly rare at the time.

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The military Mle1855 pistol, produced by MAS.

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Three other civilian examples.