hello Roy - interesting glasses.
you may well end up being corrected by someone........

the late Georgian period occupies less than a third of the C19, and unfortunately for us rough pontil scars can occur throughout the C19 and into the twentieth.
It appears your glasses have been either sand blasted or acid washed, with than opaque banding round the bowls, over which there appears to be enamelled decoration. My own opinion is that the enamelling is contemporary with the date of manufacture, but let's see what others think.
When you say the feet are thick with the suggestion that these are toasting glasses, are you thinking of proper 'firing glasses'? - if so then again my thoughts are that these aren't 'firing glasses'. What is the extent of wear, if any?
My suggestion, for what its worth, is that your glasses are not British - just a feeling.
But.............. big request Roy...... when you're adding pix of clear glass it will help massively if you use a uniform dark background - it's sometimes difficult to see detail when looking at clear glass against a white background.