Puckerings has dated this piece to the 1910s.
With a bright shiny patina the engine turned decoration below is showcased, a really pretty example.

The underside is where the hallmark can be found for Birmingham 1912 together with the makers initials for the silversmith, Charles Edwin Turner.
Excellent condition with undamaged enamel measuring 1 3/8" in diameter x 3/4" tall.
Item ID: 40423
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Puckerings has dated this piece to the 1910s.
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