The Vintage Wrist Watch Company has dated this piece to the 1920s.
The movement is not signed but would appear to be Helvetia.

The watch measures 31mm wide excluding the winding crown and 31mm high excluding the lugs. The case is silver and there are hallmarks inside the case back for London (import mark), 1924 with an importer’s mark for Arthur Rendell on behalf of Robert Pringle & Sons. In its day, Pringles was of one of the UK's largest wholesalers of jewellery, silverware, clocks and watches. The case is in good condition for a 1920s piece with just one small indentation to the back.

The lens has a couple of marks but is acceptable.
The watch has an enamel dial with a subsidiary seconds dial and an outer minute track. There are some faint hairline cracks around number 3 and beneath the subsidiary seconds dial but not too obvious to the naked eye.
A new dark brown leather strap has been fitted.
PRICE INCLUDES WORLDWIDE POSTAGE
The Vintage Wrist Watch Company has dated this piece to the 1920s.
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