The Vintage Wrist Watch Company has dated this piece to the 1940s.
The movement is signed Marvin.

The watch measures 31mm diameter excluding the winding crown and the lugs. The front of the case case is plated and there is some marking and pitting commensurate with its age. The snap-on case back is stainless steel and it has the Marvin name inside. The back of the watch has the original owner's initials of W.M.K.

The lens has three short scratches but you have to look quite closely to see them.
The signed dial has a very good vintage look. It is in its original finish which has darkened with age and there is faint freckling. Blued steel hands, subsidiary seconds dial and an outer minute track.
The watch has a later black leather strap.
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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