couldn't agree less

If you look in Bickerton at drams from the period you mention (mid C18), there appears little similarity with the shape of the op's glass here.
With drams from c. 1745 the stems are un-adorned, the bowls mostly ovoid or ogee and smaller in capacity - heights can of course vary.
I could be wrong, but the knop on this glass looks more like an annular or flattened example rather than bladed.
Folded feet certainly decreased after 1750 - 60, but as mentioned earlier in this thread, they also re-appear not uncommonly in the first quarter of the C19, so not a reliable guide on their own.
The Excise Act of 1745 (implemented the following year I believe) didn't increase the tax on glass, it was rather the beginning of something that was doubled in 1777, and I think levied even higher in subsequent decades, and it was for this reason that around 1745 or a little later that some English manufacturers re-located to Ireland, which at that date was unaffected by what was an English revenue only. However, if you know of an earlier Excise Act do please say - according to the books 1745 was the first of such revenues acts on glass in the U.K.
sorry, just realized my lack of courtesy - welcome to the GMB by the way.
