NOTE: Sid Lethbridge - US Glass has been speculated as the maker but I am not aware of any evidence to support that guess. There are two goblet varieties associated with this pattern, differing medallions. The medallion of the ring neck goblet matches the tumbler and mugs while the plain fluted stem goblet has a different medallion design."
NOTE: Jim Thielen 2022 - "This one is definitely flint glass though, it has a ring and lights up bright blue under short wave UV florescent light."