Conn New Wonder Series I Tenor
Date: 1922. Image by VintageSax
All "New Wonder" Saxophones after 1917 had rolled-tone-holes
In the following video Matt Stohrer gives an in depth overview of the mechanics of the 10M New Wonder (I) Tenor Saxophone: Repairman's Overview: 1924 Conn New Wonder (Series I) Tenor Saxophone.