Hi ,
The glass is a reproduction of an 18th c style,but not quite right !!,as Christine says copies have been around for a very long time and this one could be anything from last week to possibly a 100 yrs old, seeds,inclusions etc are signs of being hand made and not introduced for fakery , just the results of being hand blown , the wear to me looks pretty normal for something that's possibly been around for a few decades and does not in my opinion look reduced in size.
cheers ,
Peter.