Nope, one of my 93xxx SX90R tenors has soldered-on tone hole rings but I had a 96xxx that had "true" rolled tone holes. It's gonna be VERY difficult to establish an exact serial number for when several subtle - and not so subtle - design changes were made, especially after the Boosey & Hawkes buy-out in the early '90's. Notice I say "changes" - not necessarily actual "improvements"".newking70 said: