Hi, Does anyone know anything about Vandermark glass. I have tried lookingfor a vase I have.... it is iridescant peacock blue, painted with quite grotesque pinky flowers and swirls. The base is marked Vandermark DM/SS 7M 1980. I am guessing that the 1980 is the date.... I haven't a clue what the 7M means. It is a pretty piece, but not my thing at all. I want to list it for sale, but would like to know a bit about it. I don't want to list the date if it's a design number. I would be grateful for any info. Thankyou for reading.