At the turn of the last century, lockets like this were produced en masse for the middle and working classes. It isn't solid gold, but "gold back-and-front" which is kind of like gold fill. It wears well and has a nice old gold color that passes for the real thing. Both celluloid lenses and frames are intact - it looks like this locket was never worn. The monogram "ATK" is engraved on the back.