This is such an interesting vintage pin.  I believe it is possibly enamel on copper.  Flaw: some scratchs in the enamel in lower left corner as you look at it and on the back a long one.  Still in good wearable condition.I thought the picture was of comedy/drama masks but then realized they aren't.  Still great for a theater enthusiasts.  Raised outline creates design which is filled in with enamel.  Has an old c clasp.  Measures about 1 11/16 x 1 3/16 inches.  Very unusual.

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