You might have a Jacobite glass, some of which date to the Jacobite Rebellions in the early 1700's. If the image is "Bonnie Prince Charlie" "The Young Pretender" (rather than his father who was responsible for the First Uprising in 1715,) then this relates to the Second Jacobite Rebellion of 1745.
Please post an image, as that might help a more experienced person than I, to date it accurately. You should be aware that originals are scarce, and there are many later copies.
Regards,
Le Casson