Julie Cartwright Antiques has dated this piece to the 1910s.
The sides fitted a hallmarked silver belcher chain. The centre with a silver ball clasp.

Both sides of the frame are separately hallmarked.
Hallmarks:
H.W.LD for Henry Williamson.
925 silver fineness.
Birmingham import mark.
Date letter "r" for 1916.
Condition:
Very good condition.
Dimensions and weight:

Length (excluding the chain) : 14cm / 6 inches.
Width: 14cm / 5.2 inches.
Weight: 148g / 5 1/4 oz.
Postage UK: £8 Special Delivery Next day.
Postage overseas: £12 International Signed For.
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Julie Cartwright Antiques has dated this piece to the 1910s.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page