Julie Cartwright Antiques has dated this piece to the 1920s.
The hinged cover opening to reveal the original mirror.

The back with engine-turned decorations.
Hallmarks:
J.G LTD for Joseph Gloster Ltd.
Birmingham Assay Mark.
Lion Passant.
Date letter "x" for 1922.
Dimensions:
7cm diameter / 2.6 inches.
Condition:
Good
Enamel in good condition. No losses or chips.

very minor surface wear commensurate with age and use.
Back in very good condition, no dents.
Snaps shuts nicely.
Postage:
PLEASE DO NOT FORGET TO ADD POSTAGE AT CHECKOUT.
Postage UK: £8 Special Delivery Next day.

Postage overseas: £18 International Signed For.
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Julie Cartwright Antiques has dated this piece to the 1920s.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page