I am the previous owner of this watch. Case and Movement marked L0. I believe it is a Belmont. I have an ad photo but I'm not sure if I own the copyright so I'll let the membership see what it can find.
I beleive this is a 1953 Belmont, not a lot of info to be found on this watch. There's only one in the watch data base which is a 1950. I did find one Advert from 1951.
Case and movement stamped L3
The case measures 38.50mmx26.00mm
I haven't seen this model before. After given the crystal demensions Scott figured out the probable model name as the Belmonte. A heretofore unknown model.
This guy is in refurb/parts watch shape.