regret to say that I can't see this cut pattern in my books - shame, would have been good to find a name for it. Very attractive cutting though, very deep mitres and that pinwheel (a genuine States only invention) is big, quality from a craftsman. Won't bore you with names of many of the possible factories, as sure you will find them your side just as easily, but just for sake of interest for the other couple of people who may read this thread, would comment that major revolution your side re items like this was Henry Fry's invention of the 'figured blank' around the very beginning of the C20. Traditionally, cut decanters were produced from scratch from mould-blown blanks - but ingenious Mr. Fry (from Rochester, Penn.) obviously saw a profit to be made by producing a pressed blank with the outline design already there - thus saving the cutters a lot of time and work and halving the cost. Cutting shops bought in these figured blanks and could follow not only the pressed design, but add some variation of their own, by cutting and then polishing the pressed design. However, apparently the purists didn't like his approach and it's said that his idea marked the end of the true rich cut period. How difficult it may or may not be to determine whether a piece was produced from a pressed figured blank, or cut from scratch from a mould-blown blank, I really have no idea.
All of which gets us nowhere with your pieces - shame we couldn't tease your fellow countrymen out of hiding to comment.
Ref. 'The Decanter An Illustrated History of Glass from 1650' - Andy McConnell - 2004.