This auction is for a very nice set of 6 different clear glass Coffee Muds made for GULF OIL. They measure about 3 1/2" tall and about 3 1/8" in diameter. These glasses all have a different description of a different time period on the backside with no other markings. These glasses are in very good to mint condition. This would make a great gift for someone or a good item for your own collection. It is unmarked as to a maker. CR-F