not entirely sure I understand the term 'manufactured rim' - but going on the idea that this implies something that is 'made', then are we speaking of a cut/ground/bevelled/polished rim?? If so then it might suggest a Continental piece rather than British. A typical fire polished rim might suggest this was from anywhere, but it then might lean more towards British.
Isn't there always something you've never seen before

this step/prismatic cutting (common on early C19 decanters) which seems to rise from the foot and continue uninterupted to half way up the bowl, is a new one on me on a drinking glass such as this. According to Andy McConnell, 'prisms were the defining cut of the second Regency period of glass cutting c.1810 - 1820' - of course if this one isn't cut then I've just wasted a paragraph.
Most of the decorative features on this piece - the relief diamonds, the vertical blazes, the prismatic cutting (if that is indeed what it is) are, as you probably know, all types of cutting from the early C19, although the multi-radial star (does it have 32 points?), was apparently something that originally dated to c. 1840 - 50.
Feet that are larger in diameter than the bowl rim indicate first third C19 (and earlier), generally. Features like wear, stones/seeds/colour/lack of symmetry etc., might help to date, as they often do. You say that it rings, so presumably a good quality lead glass construction by the sound of it (forgive the pun).
You'll never find the maker, obviously, and it this were a genuine piece it might be early to mid C19 in date, but it seems an oddity to me, and would be very interested in hearing thoughts from those who have more knowledge of drinking glasses.
