Here is a red and black oval cameo pin. The black is glass with a faceted bevelled edge, the red is an early plastic. It did not test positive for bakelite, so I think is celluloid. The pin is 1 1/2" x 1 1/8." It has a metal back and an early pin closure with a C clasp.
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Happy New Year! Best Wishes for a happy, healthy, and prosperous 2017.