The wide slicing on the upper circular part of the foot, I'd agree is probably not British, especially on these square plinth glasses. British pieces occasionally have crescent shaped cuts seen on the outer half/third of circular feet, that occur on thicker round feet on some monteiths and salts from around 1800 - 1820.
I think the text in your link is referring to an origin of north Bohemia, which was adjacent to what is sometimes called Silesia.
I would doubt that with a glass such as this there would work done at a later date - all that you see was probably original to the date of the glass, and bevelling was more common on Continental pieces. That's not to say that some reduction of the foot size couldn't happen - to remove damage possibly.
Just my opinion, but your glass may well have been from that part of Europe, around c. 1800. Rather basic wheel engraving, and an interesting boot sale find in these leaner days
Let's hope others will also give their opinions.