Produced from 1920-1933 in Crystal, Moongleam, Flamingo and Canary.
Pieces are marked 'PAT' 8/30/21. According to the Heisey Glass 1896-1957 Book by Neila & Tom Bredehoft, the Design Patent was issued as #58832 with Andrew J. Sanford as designer. They are also marked with the 'Diamond H'.
