Julie Cartwright Antiques has dated this piece to the 1930s.

Hallmarks:
CSG&Co for Charles S Green & Co Ltd
Birmingham Assay Mark.
Lion Passant.
Date letter "M" for 1936.
Dimension and Weight:
Height: 9cm - 3.4 inches.
Rim diameter: 6.5cm - 2.4 inches.
Weight: 108 g - 3.3

Condition:
Excellent, no dings, no dents, not engraved.
Rich gilt interior.
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 1930s.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page