The Vintage Wrist Watch Company has dated this piece to the 1940s.
The jewelled movement is stamped Jenco Watch Co, Seventeen 17 Jewels, Unadjusted, Swiss.

The watch measures 33mm diameter excluding the winding crown and the lugs. The chrome plated case has some wear and pitting commensurate with its age but overall it has a good vintage look. The screw on case back is stamped Jenco, stainless steel back, no-magnetic, Swiss and waterproof although, as with any vintage watch, I would not rely on it being waterproof.

The lens is in nice condition.
The dial is signed Jenco, waterproof, shockproof with Swiss made at the bottom. The dial has light surface marking although acceptable for a 1940s piece. It has a great vintage look with original hands, centre seconds hand and an outer minute track.
The watch has a new black leather strap.
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