Hi ,
Sorry you have been told this is a Georgian glass, it isn't ,as said before the foot appears flat, you confirm the pontil area is convex also the metal looks too bright and shiny ,also for the proportions of the glass the stem looks too thin to me for an 18thc glass .Many glasses like this were made in the early 20th century in an 18 c style , until you have seen and handled hundreds of period glasses then these can easily lead you to believe they are period.
cheers ,
Peter.