You have opened a Pandora's box of history here, more than what a forum can read.. In 1878 Paris had exhibitions..coins, pocket watches..items that shined gold..hint hint..the name Prize Medal is a brand that made such items and was registered in France. most say exhibition Prize medal... yours is stamped with a lot number but value is hard to determine as you have WHAT LOOKS to be the back casing. There movements is what was defined and judged at the time, very similar to our Railroad Elgin specs of yesteryear.. Hope it helps, AWESOME find.