Ok, I saw this post on another forum and people had the same answers. He is asking specifically for "American" made Nicholsons.
All I can say is good luck! I've heard of a few people finding them in old shops but I doubt your gonna find any at an online supplier. I guess you could just call the companies listed and ask if they still have U.S. made left but I doubt it. I can tell you right now that Lee valley and 3rivers are all brazilian.