Andrew Cox Antiques has dated this piece to the 1910s.
There is a attaching chain with finger loop making it a practical and eye catching accessory. Dimensions below.

Postage and packing £8.00 UK
£16.00 Europe
£22.00 Outside Europe
Condition :- Excellent, with no losses, dents or splits.
Hallmarks :- Clear and readable.
Maker :- S Blanckensee & Son Ltd.
Date :- Birmingham 1915.
Height including chain and finger loop :- 20 cms.
Height to top of clasp :- 12.3 cms.
Width :- 17.5 cms.
Depth :- 1 cm.
Andrew Cox Antiques has dated this piece to the 1910s.
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