Based on the shape and cuttings, I really don't think they are US made. Only a couple of companies in the US could have made them, and neither one is their shape (thinking of Pairpoint/Mt. Washington and Steuben). These are most likely English or European. It is a marvelous set and I would be proud to own them if they were in my collection. I was almost like Pavlov's dog when I looked at the photos.....I seemed to have gotten a bit of excess moisture in my mouth while looking at them!
Mr. Vaseline Glass