Andrew Cox Antiques has dated this piece to the 18th Century.
Dimensions below.

Postage and packing :- £8.00 UK
£14.00 Europe
£16.00 Outside Europe
Condition :- Excellent, with no dents or splits.
Hallmarks :- Clear and readable. Absent town mark (Not uncommon).
Maker :- John Rich.
Date :- London 1791.
Width :- 4.3 cms.
Height :- 2 cms.
Andrew Cox Antiques has dated this piece to the 18th Century.
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