The Vintage Wrist Watch Company has dated this piece to the 1910s.
The watch has a stem-winding movement, Longines calibre 18.
The movement has the serial number 2,400,518 which dates it back to 1910.

The watch itself measures 47mm diameter excluding the winding crown and the loop. The case is silver and there are hallmarks inside the case back for London (import mark), 1912, with a case maker’s for François Borgel (his mark is inside the case back). Borgel patented the eponymous Borgel watch case in 1891, a real step forward in waterproof and dustproof watches cases, making pocket watch cases first and subsequently moving onto wrist watches as fashions changed.

François Borgel was a successful inventor and business man, and his business became one of the most important watch case manufacturers of its time. Early adopters of the Borgel screw case included Longines and the International Watch Co. (IWC). After François Borgel’s death in 1912, the business was carried on by his daughter Louisa.
The inside of the case back also has the AB mark for Alfred Baume, the UK importer for Longines.
The case has some small marks but overall is in good condition for its age. There are some elaborate initials engraved into the back of the case.
The watch glass has some scratches but they are reasonably light.
The white enamel dial has a few hairline cracks to the bottom half but they are not immediately obvious. Lovely blued steel hands (initially set by way of the pin set mechanism), a subsidiary seconds dial and an outer minute track.
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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