The Vintage Wrist Watch Company has dated this piece to the 1910s.
The circular section which contains the stones measures 17mm diameter. There are hallmarks to the side for Birmingham 1913, with a maker's mark which is difficult to read but appears to be for Pearce & Thompson. There is some unevenness to the gold around the stones; the stones are nice and secure.
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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