don't think I can add much to what's already been said, and would agree they might date anywhere from c. 1810 to 1840 odd. I have three with folded feet, and as you'd expect those have pontil scars, and I've written c. 1820 on one of them.
In general, I get the impression that with the better quality examples they have double or triple stepped collars where the stem joins the bowl - and this sort are often of lead glass with a good ring.
Height is commonly around 10 - 11 cms., with feet less than flat and about 6 - 6.5 cms wide.
Probably a glass that was common in taverns and pubs - and although I'm not sure, many of them may well have been for port - many lack quality and are quite crude in manufacture. Origin wise, they could be from anywhere, so probably no point in speculating, other than to say that .......... it's possible that those with cut/polished/bevelled rims are Continental, and the same sort are sometimes found with heavy slicing on the bowl.
The cyst - where the stem joins the foot - is again very variable - it may just be that on the better quality examples this is smallish and well defined, rather than chunky and slightly irregular as on tavern pieces.
I've also noticed them in charity shops, occasionally, and they can often be found for £1 or less even - so obviously a very commonly made form of drinking glass in the first half of the C19.