The Vintage Wrist Watch Company has dated this piece to the 1940s.
The watch measures 30mm diameter excluding the winding crown and the lugs. In the 1940s, the fashion was for men to wear smaller watches such as this one; with today's fashions, it would suit a man with a slimmer wrist or it could be worn by a lady. There is some marking to the case but it is acceptable for its age.

The lens is in good condition.
The dial is signed Muros, 15 Rubis, Shock Resist, Waterproof, Swiss Made. As with any vintage watch, I would not rely on it being waterproof. There are a few small marks to the dial but overall it is in an acceptable condition.
A new black leather strap has been fitted.
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The Vintage Wrist Watch Company has dated this piece to the 1940s.
Specialists in antique and vintage wrist watches and pocket watches
You can view the stock and full dealer information on the The Vintage Wrist Watch Company Profile Page