Here is an apothecary jar with label under glass. Label reads Mag: Calc:, I assume it means Magnesium Calcium? Base reads Y C Co. Not sure if it has the original stopper? Any info about its age & value would help.
The base reads Y C Co. I have never heard of this maker's mark, would be glad if someone could tell me about it! Y C Co is in a hexagon shape with a line cutting through the middle between Y C & Co.