The Vintage Wrist Watch Company has dated this piece to the 1910s.
The watch has a stem-winding movement, Longines calibre 18.68N, which is working nicely. The movement has the serial number 3576742 which dates it back to 1917. The movement is protected by an inner hinged cover.

The watch measures 48.8mm diameter excluding the winding stem and the loop. The case is silver and there are hallmarks inside the covers for London (import mark), 1918 with an importer's mark for Arthur Baume, Baume & Co were the importers of Longines watches to the UK and the British Empire.
Overall, the case is in good condition, just a few small “dings”.

The winding crown pushes in to open the front cover.
Inside there is a glass lens which is in nice condition.
The dial has a couple of very faint hairline cracks between 4 and 8 although not over noticeable to the naked eye.
The watch has blued steel hands, including the special half hunter hour hand so that the time can be read when the front cover is closed.
The watch comes in a new presentation box.
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