I believe the Adler's were considered good machines, well made. Adler did or perhaps still does... commercial machines too. I saw a craiglist ad for Belvedere, but I don't remember if it was a 15 style or not. I seem to remember it looked more like a Singer 99k. But I could be sooooo wrong. Sounds like a great machine to have. Got a picture of it you can post here?