Julie Cartwright Antiques has dated this piece to the 1920s.

The loaded base lined with black Morocco leather.
Hallmarks:
GB&S for George Bentjemann & Sons.
London Assay Mark.
Lion Passant.
Date letter "f" for 1920.
Condition:
Very good.
Tortoiseshell in excellent, glossy condition.

Swivel action in excellent condition.
Very minor dings round the silver casing.
Sits evenly on flat surface.
Good set of marks.
Dimensions:
Diameter: 7cm / 2.4 inches.
Height up to finial: 3cm / 1 inches.
Postage UK: £8 Special Delivery Next day.

Postage overseas: from £12 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