sorry Ekimp - our words have crossed, apologies, I just hit send twice and it went. I see we both agree on the replacement stopper

firstly ............. sorry to say, but the wheel engraving on the Waterford bottle doesn't look like mine at all - the garland of leaves, or whatever, is simplistic and small in detail compared to the broad engraving of leaves, vine leaves, grapes and bird etc. on mine - but of course thanks for posting and trying to help. The garland engraving is akin to what we call pteridomania, I think.
Apparently, there were an identical pair of these, and Phelps Warren showed both in his 'Irish Glass' which was re-printed in 1981 - whether the V. & A. have both I don't know. Apart from the leaf decoration, the harp is beautiful, likewise the crown engraving and the three triple neck rings are impressive.
Warren wrote of these two .............. "The pair of decanters engraved 'Success/To The/Waterford Volunteers/1782' (Plate 10) presents another enigma. Except for a slightly full body, the outline here has the characteristics of a Penrose Waterford bottle: very wide lip, three triple neck rings, generous profile, moulded comb flutes of appropriate size. Yet the Penrose Waterford glass house, which produced so many bottles akin to this one, was not founded until 1783. The date 1782 is presumably commemorative."
Off-hand I can't remember how the dates stack up re the Richardson beginnings, but agree that the bird is almost identical - probably a pheasant I think - and most of the other engraving is very similar to mine - could even be the same hand. However, IMHO the stopper is a later replacement - it doesn't have the grandeur which would compliment a bottle of high quality. The quoted date could also be a tad optimistic and possibly a little early for these shaft and globe bottles. I'm always a little cautious when a high end piece is offered without some evidence of provenance or attribution - this may be a genuine Richardson decanter from c. 1840, but would have been good to see that someone had made the effort to locate a source of proof.
The very early years of the Richardson dynasty are complex and involve one of the Webb's I think, I will have to read Hajdamach and see if I can fathom it again, but you could be right that there wasn't a Richardson Company at the date in question.
thanks again.