c.1958 Longines Automatic Mystery Gents Dress Watch 
 
A lot of watch brands produced Mystery watches around the 1950's from Jaeger Le Coultre through to Bulova and Elgin, this is one of a number of Mystery Watch designs  produced by Longines around that time. 
 
The case is 10k Gold Filled throughout and is in good condition, the champagne gold dial is in very good condition showing little signs of ageing 
Inside the case is a 17 Jewel Swiss Lever Automatic Movement signed Longines 
 
Cosmetically Overall this is in very good condition and running well