The Vintage Wrist Watch Company has dated this piece to the 1910s.
The watch has a good quality hand-winding movement, signed Cyma, which is working nicely.
The watch measures 28.5mm diameter excluding the winding crown and the fixed wire lugs.
The case is in very nice condition, as is the enamel work surrounding the small lens. There are some small marks to the lens but you have to look closely to see them.

The dial is signed Cyma but it is very faded. Some trench watches have bezels that hinge open, this one is a fixed bezel and was never designed to flip open.
The watch comes on an expanding strap which is unhallmarked but is testing as low grade silver, probably Continental.
The watch comes in a vintage presentation box. The catch doesn't work as it should be still clips shut.
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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