Statue of Ignace Hoff by Auguste Bartholdi at Cimetière du Père-Lachaise in Paris.
It seems to be a pinfire revolver but not a M1854, probably a Liège one ?
Well it’s a sculpture not a photograph so I guess it’s not a Lefaucheux or anything else. And Auguste Bartholdi was French so I guess it makes this gun French!
Also, For those who don’t know, Auguste Bartholdi is also who sculpted the Statue of Liberty.
C’est probablement un revolver belge de type Stonewall Jackson