The Vintage Wrist Watch Company has dated this piece to the 1910s.
The watch has a hand-winding movement which is working nicely. The movement has been identified as by Tavannes, and indeed the patent date of May 1904 which is stamped on the movement relates to for a negative set stem winding and setting mechanism granted to Sandoz, founder of the Tavannes Watch Company.

The watch measures 36mm diameter excluding the winding crown and the fixed wire lugs. The case is silver and there are hallmarks inside the screw-on case back for Birmingham 1914, together with a case maker’s mark for Aaron Dennison, a prolific Birmingham based case maker and supplier to various companies. The front and sides of the case are in good condition. The case back has some unevenness.

The glass lens is in good condition.
The hands have been overpainted at some point.
The watch comes on a new leather strap.
The Vintage Wrist Watch Company has dated this piece to the 1910s.
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