We haven't come across too many like this. This is a 1950's really nice Gents Vulcain Key Fob Watch. The Fob is Silver plated and is in pretty good condition, bearing in mind it could have jangling around in someone's pocket with all their small change it's in remarkable condition.The outer dial has Latin Numerals engraved on the case, the dial itself is quite clean and readable, the back of the case has a see through panel in which you can see a signed Vulcain 15 Jewel Swiss Lever Movement. 
The is currently fitted to a new Black Leather Key Fob and is very elegant. 
Overall cosmetically this is in very good condition and running very well.