Hi Simon - to be honest, knowing that the glass has a lead composition metal, won't help identifying a maker, remotely - high quality table glass from c. 1680 to present was/is often made using lead oxide in the batch - apparently it makes for a glass more suitable for cutting or wheel engraving, and of a better colour.
Originally, a lead content added to the glass also helped remedy/ameliorate the problem of 'crizzling/crisselling' - a glass disease that can mean the end of the life of the glass - it causes weeping (literally) and fine crazing of the piece.
Assume when you say 'mid 17th century', you're implying c. 1750s etc., rather than the standard interpretation of 'mid 17th century', which academically implies we're speaking c. 1650s - which would be way too early for lead glass such as your pieces. and with their style and form of decoration. We tend to stick to this way of interpreting previous centuries to avoid confusion.
Your earlier thoughts of second half C19 - i.e. c. 1850s is a more realistic suggestion - to be honest, I did wonder if the lions paw was resting on a croquet hoop - perhaps your family had been league winners and this was incorporated into the heraldic image;-) Only joking, of course - regret I know nothing of 'an arch with columns gules'.
Unfortunately - and clear glass in particular falls foul here - pieces that lack backstamps showing a makers trade mark or some other form of trade name etc. can be notoriously difficult or impossible to id. Some art glass is known to be by a specific maker because of - shape, colour, iridescence, style etc., but otherwise we fail often to find the answer your want.
Drinking glasses fall frequently into this group, and both drinking glasses and decanters, particularly pre 1920s - as you've discovered - are rarely if ever marked.
Neither can we be sure of the origin of your suite - it might have been made in the U.K. but equally it might have started life in the other places you mention, and looking at the glass doesn't help at all, though if pushed I'd like to think it was the U.K.