Julie Cartwright Antiques has dated this piece to the 1910s.

Hallmarks:
Inner cover fully hallmarked.
Sovereign frames with date letter and Lion Passant.
J.G LTD for Joseph Gloster Ltd.
Birmingham Assay Mark.
Lion Passant.
Date letter "l" for 1910.
Dimensions:
Diameter: 3cm / 1.2 inches.

Height: 1.5cm / 0.6 inches
Weight: 16 g .
Condition:
Good.
Sprung mechanisms in very good order.
Push button in very good order.
Snaps shut nicely.
Strong hinge.
A little surface wear, commensurate with age and use.

Postage:
PLEASE DO NOT FORGET TO ADD POSTAGE AT CHECKOUT.
Postage UK: £7 Special Delivery Next day.
Postage overseas: £15 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