The Vintage Wrist Watch Company has dated this piece to the 1910s.
The watch has a 17-jewel stem-winding movement, identified as Electa, which is working nicely.

The watch measures 46mm diameter excluding the winding stem and the loop, so slightly smaller than the standard 50mm size but not as small as a lady's fob watch. The case is silver and there are hallmarks inside both of the case backs for London (import mark), 1917 with an importer's mark for Arthur Rendell.

In 1907, an act came into force which meant that all imported watches had to be assayed in a UK assay office and marked with British import hallmarks. For this, a sponsor's mark was required. In this particular case, Arthur Rendell was an employee, and probably in charge, of the department that handled imported watches at a company called Pringles, the UK's largest wholesalers of jewellery, silverware, clocks and watches, so it was deemed relevant to use his initials.

The front of the watch has a small lens surrounded by enamel filled Roman numerals. It is in good condition with just light surface marks. The back of the case has unevenness.
The winding crown pushes in to release the front cover.

Inside, the glass is in good condition, as is the white enamel dial with just one faint short hairline by numbers 7 and 8 but it is difficult to see with the naked eye. Blued steel hands, including the special half hour hand so the time can be read even when the front cover is closed.
The watch comes with a single silver albert, 34cm long including the T-bar and the clasp. The T-bar is hallmarked for 1907. Each of the links has the lion passant silver mark. The clasp is a later white metal replacement.
The watch and chain will be sent in a new presentation box.
Free UK and worldwide postage
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