Reference your link Dirk ............. always a shame when people don't provide sizes, and because of this omission we're left unsure whether the linked piece was large i.e. c. 30 cms. and actually used for wine/claret - or if perhaps it was smaller like yours and described as ewer simply because of its shape.
I had already looked through Phelps Warren - in fact the reference to 'Irish Glass 92c' refers to the author's first effort at his book in 1970 .... it was improved and re-published in 1981.
The Duke of Wellington's ewer (referred to as 92c) is c. 31.5 cms. tall, and quite different in cutting style to your piece - lucky old D. of W. Ewers, in the form of classical shapes, show much variety in cutting, and there don't look to be that many in the book with which to make a balanced judgment, unfortunately, and those that are shown don't quite match the cutting on your own piece.
You can debate these things all day and still not be sure, but it might be relevant to say that generally Anglo Irish cut pieces from the Regency period should have good deep cutting - especially the prismatic cuts.
Your own piece is unusual in that it appears to have scale cutting - unusual in that I don't recall seeing ewers and related pieces cut with that form of decoration, from that period.
Larges pieces of Anglo-Irish glass were decorated with ...... strawberry diamonds, relief diamonds (large and small), prismatic cutting, saw tooth rims, scalloped rims, slice cutting of varying sizes, and even circular printies.
Also, on the majority of Anglo-Irish cut pieces it looks to be that almost the entire body is covered in cutting - I say this as yours looks to be a little smooth in the rear quarters

- might this suggest that yours in not Anglo-Irish, but still the period you are thinking of?
Might yours be for a single serving of claret at the table perhaps?
Sorry, we're no further forward, and as I say we might debate these things all day and get nowhere - you need an expert.
