Vintage Black Celluloid Cameo Mother Of Pearl Locket Engraved Pendant Necklace

The pendant is just under 1.25 inches long x 1. The chain is approx 19 inches long.

The gold is very worn, discolored, and scuffed. The chain appears to be brass with discolorations. The backside is engraved with initials MJ or MT.

I am unsure if the cameo is resin or celluloid. But I think it is celluloid.