sure - in the absence of any pix showing the underside of the foot, then we take your word for it. Digital cameras, rather than mobile phones, are far preferable for photographing glass - that's not to say you have used a mobile, it's just that I notice so many folk now use their phone rather than a camera. Good lighting is essential - raking light is a good means of capturing difficult surfaces where small or shallow features need to be seen, and if reflected light rather than transmitted light is used then this will light up a surface and show small details. As the name suggests, very low angle light, bounced off the subject, tends to create pool of almost mirror like light, on the glass, causing the small details to show as darker points. The backgrounds to some of your pix are 'too busy' - plain dark backgrounds are preferable - it's not easy to get good shots of clear glass, but a plain ground will help rather than a tour of someone's furniture or back garden

Generally speaking, untreated snapped pontil scars ceased c. 1740 - 60, after which time the polished depression becomes the norm. Unfortunately, not all glass makers were following the script, and the scar pops up every now and again for probably over a hundred years - often found on utility or tavern glasses or, of course, those pieces intended to look old or confuse, of which there were many c. 1920 - 30 when repro. styles were all the rage.
Would still like to hear in your own words why you consider this glass might be old - always good to hear the opinion of others - none of us is that good that we can't benefit from someone else's knowledge Your subject heading of 'Georgian/Victorian?', covers a vast wedge of history - 1714 to 1901 - a total of six monarchs, during which time the manufacture of glass, shapes and styles changed massively.
Seeing our thoughts in writing helps not just others but ourselves too - just talking about the evolution of glass is a great way to learn.
It's all too common to read descriptions - especially on the bay - where something is described as Georgian/Victorian - not only does it show the seller knows nothing about glass, but worse still they simply can't be bothered to investigate.
You might show your glass to a professional for an opinion - failing which it will likely remain not just anonymous but also undated. Assume it came from the wild? My opinion remains that this piece is most likely to be from somewhere in the last one hundred years rather than C18 or C19.
Hope you won't be offended by the foregoing - it's really intended to help and we all have to start somewhere, and most of us make mistakes along the way - remember, people who don't make mistakes don't usually make anything.
