Hi ,
someone called !!!!
For all the reasons pointed out by both Paul and Roy and from what I can see it looks more like a 20th c interpretation of an 18th c Baluster, it could be 19th I suppose but all the ones like this I have seen over the years were 20 th c , many places have and still make reproductions/in the style of etc , Corning , Stueben and the "georgianglassmakers" over here (who make the best reproductions I have seen to date) all with the expected hallmarks of old glass , folded feet , pontil marks etc and are available off the shelf today,if it was in a public auction attended by experienced dealers and collectors it would have fetched under normal circumstances a Baluster price, I assume it didn't.
cheers ,
Peter.
ps , had another look and this glass looks like it has been made in 2 pieces ,bowl and stem 1 piece the foot the other , is it ? if so this would be very very unusual for a period Baluster glass with this bowl shape.