Nice glass i had a couple of these a few years ago and seem to remember that my research
into them came to me thinking that it was a dram glass. My one also had broken pontil
scar as yours but did not have an illusion on the bowl which is rarer i would think??
Possibly date wise i would be happy to think last half of the 18th century. They do come with
a terraced foot also in this shape glass which is lovely if you find one. May have been made
as late as 1880 but with cleaner metals and polished pontil scars more refined as time went on.
