I have a question on my locket It is F.M.co marked and sterling marked on the inside on the rings of the locket but no where else I was wondering if anyone could tell me the age and about how much this would be worth the first picture is of the locket before I cleaned it the second is of the locket's front side the 3rd is of the back side of the locket and the last one is of the locket's inside now the inside of the locket looks like a goldish color this is due to the celloids discoloration to a golden color due to age this is not the color of the locket if you in large the last picture of the inside of the locket you will see where it is stamped F.M.co and sterling both rings are marked this way the rings are the only part of the locket with any kind of markings at all. Whoever owned this did not even have it engraved. So this piece is in its original condition no altering has been done to it please help me with the age value and what company made it there are two different possibilities on the companies I am wanting to know which one made it it weighs just at .3o oz. or 8.6 g. I hope the pictures help.