the thinking behind my suggestion of a sweetmeat related item came from the overall appearance which first off made me think that this was an over-sized jelly or custard - unfortunately it wasn't from a knowledge based idea, so rather my uneducated opinion. But, since my post I've now had a look in G. Bernard Hughes 'English Glass For The Collector 1660 - 1860', and plate 39 - bottom right - shows what I would also call a very over-sized custard/jelly, and standing at 6.25 inches. However, the author who obviously knew shed loads more than me, describes it as a 'helmet-shaped' - it stands on a flat foot with rudimentary stem with bladed knop and collar under bowl. Admittedly it has a flared top rim - hence the word 'helmet-shaped', and of course it has the pre-mid C19 pump style of handle. Hughes call his example a 'tankard', but annoyingly doesn't provide a date, although I suspect late C18 or early C19.
I've certainly seen pulley-wheel decoration on rinsers and finger bowls from the Regency period (1810 - 1830).
Hughes example does have the pulley decoration, but doesn't have your - is it folded top rim? - and lacks any wheel engraved decoration. But the overall appearance is sufficiently similar to confirm your first thought that this is for alcohol and either a tankard, or punch glass in view of the ladle.
Originally, I also wondered about a large syllabub glass.