Andrew Cox Antiques has dated this piece to the 1920s.
This pair are of a good size, being able to accommodate a standard portrait photo. Dimensions below.

Postage and packing :- 12.00 UK
£20.00 Europe
£28.00 Outside Europe
Condition :- Excellent with no splits, dents or holes. Some very small blemishes, commensurate with age and use.
Hallmarks :- Clear and readable.
Date :- Birmingham 1917.
Maker :- Charles S Green & Co Ltd.
Height :- 14.7 cms.
Width :- 10.5 cms.
Depth :- 2 cms.
Photo area :- 12.5 cms x 8.5 cms. / 5 x 3.25 inches
Andrew Cox Antiques has dated this piece to the 1920s.
Specialists in quality antique silver, glassware, jewellery and object de vertu
You can view the stock and full dealer information on the Andrew Cox Antiques Profile Page