hello Michelle - nice find, and like Chris I will offer some thoughts by thinking out loud, since I'm certainly no expert

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No folded foot - which although doesn't automatically take it out of the C18, is more inclined to make it early C19 (I would suggest) - Apparently, folded feet were created initially to assist with strengthening pieces made from soda glass - and when lead glass became more the norm, the fold was dispensed with. Looking at this foot style I'd plump for 'domed and terraced'. The ground/polished pontil mark was, I believe, a late C18 onwards characteristic, necessitated by the fact that feet became less domed, and therefore the snapped/rougth pontil mark needed to be 'ground away to avoid make the glass uneven when standing.
I believe that the bulge at the base of the bowl is described as a 'merese' - and below that is a single bladed knop, and the bowl is, I suggest, a 'flute' shape. Because of these 'knops', I suggest that the method of making the glass is not 'drawn' - and that instead, this example has been made in at least two parts. I would really hesitate to date this glass, but if really pushed would go more for the 1820 - 1830 period (still keeps you just Georgian).........however, the fact that the foot is wider than the bowl, is, in itself, an indicator of an earlier period - so that's another idea down the drain - and remember to look at the colour of the glass - is it greenish/grey, or quite white ish. Try shining the UV torch at the piece and see if you pick up any manganese glow. Having said all the above, we always have to remember that the Victorians were very good at copying every style ever made.