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 watch measures 34.5mm diameter excluding the winding crown and the fixed wire lugs.
There is also a brevet (patent) number for a 1915 application by Charles Zurbruegg which relates to the design of the opening case front. The case is in good condition.

The front cover has a central lens surrounded by enamel filled Roman numerals. There is some enamel loss in places.
The front cover is opened by pressing the button in between the lower lugs.
Inside, there is a glass lens which is in good condition, as is the dial. The red number 12 is a nice feature. The hands are period replacements.
A new leather strap has been fitted.
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