Crystalline retailer tumbler

This is a crystalline retailer glazed tumbler 71/2”. It is glazed with a clear food safe liner glaze on the inside and a cobalt crystalline glaze on the outside . Every piece of crystalline may have the same glaze on the outside but the crystals are different on every piece. This is made of porcelain and fired with electric kiln to 2345 as is all my crystalline. This is one of a kind and would make a great Christmas gift.