18ct mark on old French gold jewelry

by Robert kracauer
(Florence, MA U.S.A.)

I am interested in buying a very costly signet ring that the owner claims is mid-19C.

It has an 18ct mark on the inside of the shank. That looks suspicious to me. Just doesn't look right to me.

Do 19thC French gold jewelry have these 18ct marks?

I would appreciate any help on this.


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