The Vintage Wrist Watch Company has dated this piece to the 1910s.
The watch has a Swiss 15-jewel hand-winding movement which is working nicely. The movement is by Record and is a later, although still a period, replacement.
The watch measures 25mm wide excluding the winding crown and 39mm high excluding the lugs.

From 1 June 1907, Stockwells acted as assay agents, facilitating the import into Britain of foreign gold and silver items which had to be assayed and hallmarked in a UK assay office before being released for retail.

Overall, the case is in good condition especially for such an early piece, just some gentle unevenness to the case back.
The lens is in good condition.
The dial is signed Tissot and it has blued steel hands. Light marking to the dial, not too detrimental.
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