Puckerings has dated this piece to the 1920s.
The patina is glossy showcasing the engine turned decoration below the enamel.

The silver is fully hallmarked for Birmingham 1927 together with the makers initials for the silversmith, Albert Carter.
Superb condition measuring 1 5/8" in diameter x 1" tall.
Item ID:39431
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Puckerings has dated this piece to the 1920s.
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