Puckerings has dated this piece to the 1920s.
The silver bezel holding the beveled glass in place is also stamped " Made In England ".

The back is of course what makes this special with a glossy guilloche green enamel showcasing the starburst engine turned design below.
Excellent condition with all enamel intact. 11 1/4" x 4 1/2" at widest point.
Item ID: 32176
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Puckerings has dated this piece to the 1920s.
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