The Vintage Wrist Watch Company has dated this piece to the 1910s.
The watch has a high grade stem-winding movement which is working nicely.
This inner cover has been well polished and some gold plate has worn off.

The watch measures 50mm diameter excluding the winding stem and the loop. The case is gold plated and is stamped with the maker’s mark GBMM for Manufacture Genevoise de Boites de Montres. The hinged back has a handsome sunburst pattern with a vacant cartouche. There is the odd small mark or “ding” to the case, and a little unevenness to the back, but overall it is in good condition for a piece of its age.

The acrylic lens is in good condition.
The dial has an interesting appearance with the black chunky Roman numerals and the red inner 24 hour numbers. Pin-set hands. There is a hairline crack running down from number 12 but it is faint.
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