nice coloured example - v.g. find - handle attached top down and looking at similar examples in McConnell, I'd go possibly a smidgen earlier than suggested by Carol - possibly 1845. Agree, you're missing a cork type stopper which likely had a ball finial - since a lot of these bottles came from the Continent, then think we can't do more than say possibly English. I'd not realized the diversity of colours of these things - even uranium - and sometimes handles in a colour different to the body - I have one in cranberry - though as a type I don't see them that often for some reason.
The missing cork stopper might have had a pewter mount, but only IMHO if the metal on the neck is also pewter - otherwise perhaps simply a plated metal - are there any EPNS marks or better still Sterling hall marks. By this date, Elkington's had already marketed their invention of silver plating, so worth looking on the neck.
Bearing in mind that we don't see these often, I doubt you'll find an odd stopper that will fit easily - though as it's cork then if you do find one that looks about right you could cut the cork to fit.
Sometimes I get tempted to 'do' decanters - but they take up space, and there's literally no end to them ............. .
Sounds like you're doing well with this new charity shop - I must get down to hmmm er ................ soon