Julie Cartwright Antiques has dated this piece to the 1910s.
The front circular reserve vacant. The sprung hinged cover operated by a push button. Opens to reveal a spring loaded compartment.

Suspension loop. Snaps shut beautifully.
All sprung mechanisms in good order.
Hallmarks:
Inner cover fully hallmarked.
Sovereign frames with date letter and Lion Passant.
A.L.D. for Dennison Watch Case Co
Birmingham Assay Mark.

Lion Passant.
Date letter "l" for 1910.
Dimensions:
Diameter: 3cm / 1.2 inches.
Height: 1.5cm / 0.6 inches
Weight: 19.5 g / 0.7 ounces.
Condition:
Very good.
Sprung mechanisms in very good order.
Push button in very good order.

Snaps shut nicely.
Strong hinge.
Maker's marks very clear.
Postage:
PLEASE DO NOT FORGET TO ADD POSTAGE AT CHECKOUT.
Postage UK: £8 Special Delivery Next day.
Postage overseas: £20 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