I'm not sure what the metal is on this, maybe bronze or pot metal. It was acid tested and did not test positive for silver or gold. Gorgeous piece of history. The glass center and two side pieces may be Czechoslovakian glass, it fits the time period, but the piece is not signed. The fitting on the back looks like it may have been replaced, the pin doesn't match the brooch metal. Hinge is earlier hinge, looks like art nouveau and with the square pieces of glass, art deco. So could be the in between period . Glass as some wear, but for age is in really good condition.
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*All pieces of jewelry for sale are pre-owned, and most are Vintage or Antique. There could be wear and tear. I will provide as many pictures as possible. All Stones are tested with the Presidium Gem Tester II. All pieces are magnet tested, unmarked Gold and Silver are acid tested.

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