Royal Hickman Signed Tumbler

Today’s Museum Monday treasure from the Museum of American Glass in WV is a tumbler signed by Royal Hickman. It is a puzzle. Royal Hickman was the well-known designer for Royal Haeger pottery from 1934-1944, continuing to operate his own ceramic factory in Tampa, Florida, until 1959. He designed as a freelance artist for Heisey from 1941 to 1949, creating most of their glass animals. However, I have found no records of his designing for any other glass company. In 1961 he moved to Guadalajara. A newspaper article in 1963 mentioned that he was associated with a “crystal and glass firm in Mexico,” but it seems to have been a manufacturer of glass mosaics. This old fashioned bar tumbler is clear with a gray wash and a bright and matt gold textured decoration of birds and flowers, totally unlike any of Hickman’s other designs and in a style that does not suggest any of the Mid-Century glass companies I am familiar with. It is 3 ¼” high with a 3” top diameter. Any help with identifying a manufacturer would be greatly appreciated.