Touch of Time Antiques has dated this piece to the 1900s.
The frame is made in the most ornate sumptuous design; the original bevelled plate contained within a broad repoussé silver frame, richly decorated with dense scroll work, flowers and foliage and surmounted by a Rococo style vacant cartouche.

Fully hallmarked for Birmingham, 1909.
Dimensions:
Height - 33 cm
Width - 25 cm
Condition: very good condition with just one tiny loss to gadrooned inner edge of the silver (see photo), otherwise very light surface wear, the glass is in surprisingly good condition with just a couple of minor age-related stains. The velvet at the back is quite worn but can be replaced if desired.
Touch of Time Antiques has dated this piece to the 1900s.
You can view the stock and full dealer information on the Touch of Time Antiques Profile Page