Hello Pete - regret to say that it might take a lot of time to find a maker - assuming no marks. You might try the Replacement sites, but there have been a lot of glasses made over the years - it might be anywhere from 80 to 140 years old - wear might help to suggest whether simply old or lots of old. Printies/punties, the name given to the ovals/circles were a common Victorian form of decoration, and won't really help. Probably a quality glass in view of the pontil depression. Might be a champers glass, or perhaps a large wine/hock perhaps.
Re the folded feet - these were a feature of drinking glasses prior to c. 1760 - and helped to strengthen the foot rim and prevent chipping.
If you have some we'd be very interested to see them, and don't forget to give dimensions and let us know their origin, every bit of information helps.
However, like so many older pieces, there are modern copies, and I believe there are some very good examples still being made.