Hi,
You are not wrong, Heinrich Hoffmann, Gablonz (now Jablonec nad Nisou) used this emblem as a mark and several variants are known.
Baccarat, used paper labels, from 1860-1936 (Jackson, "20th Century Factory Glass") which consisted of line drawings of three pieces of glass.
Images would help in eliminating makers.
Regards,
Le Casson