Julie Cartwright Antiques has dated this piece to the 1920s.
The circular glass body with a fully hallmarked silver collar. The back of the hinge with patent number.

Hallmarks:
HM for Henry Matthews.
Birmingham Assay Mark.
Lion Passant.
Date letter "y" for 1924
Condition:
Very good..
The butterfly wing inset is in very good condition.
The hinge is good.
Hallmarks are clear.

Glass base with no chips.
Dimensions:
Height: 4cm / 1.4 inches.
Diameter of base: 6.5cm / 2.5 inches.
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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