This is believed to be rock crystal or quartz rather than glass. With a loupe inclusions can be seen that you won’t see in glass. And more telling are the few chips on the rim that show mineral deposits or brown spots. It has some good age to it as well. I would not say 18th century as I feel the shank would be more substantial, but I would venture to guess early 19th.
Size: NBS Medium 1”
Condition: As mentioned some minor flakes on the rim as well as near the shank
This is believed to be rock crystal or quartz rather than glass. With a loupe inclusions can be seen that you won’t see in glass. And more telling are the few chips on the rim that show mineral deposits or brown spots. It has some good age to it as well. I would not say 18th century as I feel the shank would be more substantial, but I would venture to guess early 19th.
Size: NBS Medium 1”
Condition: As mentioned some minor flakes on the rim as well as near the shank