hmmm - not so sure there really is, but expect someone will come along and say otherwise. My opinion on this is that it's Prussian - but, telling the difference between bludgeons and Prussians can be difficult at times. Most Prussians seem to have a star cut base, although doubtless there were some with a depression only, and it was a style given very much to ornate cutting, including plain and facet cut neck rings - combining some of the late C18 fashion with later Regency prisms, strawberry diamonds and fan splits. Not sure I'm happy though with these inverted fan splits - somehow don't see this as being right, but who knows. Assume the rings are hand applied - can dirt be seen down behind them?
Although this one may not be a Victorian copy of a late Georgian or Regency Prussian, it may very possibly be an early C20 copy. In the first third of the C20 there was a demand for reproduction period glass, and Richardson's certainly were knocking it out at a rate of knots, and the London retails Hill Ouston were showing masses of it in their catalogues - so there is a high probability that, assuming it's a copy, then it originated in the C20.
Can't prove a thing of course, but my opinion would be that this is an early C20 copy of an early C19 Prussian - but regarding the presence of wear, even a decanter made in the middle of the C20 and used frequently, has the potential to show a lot of wear. If this one is very clean, and lacks any staining, has virtually no damage, then I'd go for C20. Also - the obvious question - does this bottle have matching Nos.?
And the height is ...? But whatever it's provenance, origin or age.... for a fiver it's got to be a bargain.