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I have a few Salt Cellars or Salt Dips that are etched. I cant determine whether they are glass or crystal. Not sure if Libbey produced crystal. Any one with info on this issue? Date manufactured, value,?

I have a few Salt Cellars or Salt Dips that are etched. I cant determine whether they are glass or crystal. Not sure if Libbey produced crystal. Any one with info on this issue? Date manufactured, value,?