Hi ,
Poor old Franz Tieza still seems to be given the blame for reproduction Jacobite glasses even today, the less informed still attribute any and everything to this superb engraver who to the best of my knowledge did not reproduce any Jacobite glasses despite what some writers still say , he was a very fine engraver who focused on" Williamite" glasses and "Volunteer" glasses,his pattern books exist and nothing relating to Jacobites in featured, and indeed why would he provide glasses for the other side !!. his engraving technique has been studied along with his pattern books and certain features of this style make it possible to readily identify him as the creator , Peter Francis and Mary Boydell have both studied Tieza extensively and did not find any documented Jacobites by his hands , the confusion seems to have come from a comment that , " those who promoted Tieza's work in the early 20th c as genuine also offered Jacobite glasses of dubious origin, although no mention of Tieza Jacobites were mentioned when peter Francis exposed the Tieza "Williamites , assumptions were made !!!!.
having said that it is still possible that your Jacobite engraving is of a later date but without more photos it is impossible to be certain , Having worked with Dr Seddon the author of "The jacobites and their Drinking Glasses" and ian Mckenzie the discoverer of the Amen Glasses creator for the last 14 years if you would like to mail me using the little icon on the left with some photos of the rose etc I will possibly be able to be more certain if the engraving is period
btw welcome to the forum,
cheers ,
Peter.
edited to add a couple of quick snaps of a Tieza Volunteer glass