This revolver would have been made by the "Manufacture Francaise D'Armes & Cycles de St-Etienne" (usually abbreviated as "MF" or "Manufacture Francaise"), meaning "French Manufacturers of Guns and Bicycles of St. Etienne"; these were made in both rimfire and centre-fire, but aren't really the sort of thing that should be fired today, even if you could find the proper ammo. If someone collected velo-dogs, they might be wiling to pay $100 or so, but the real problem is finding that someone in the first place.