Conn 8M New Wonder (II) C Melody
Date: 1928. Image by VintageSax
All "New Wonder" Saxophones after 1917 had rolled-tone-holes. Notice the microtuner neck.
In the following video Matt Stohrer gives an in depth overview of the mechanics of the 8M C-Melody Saxophone: Repairman's Quick Overview: C-Melody Saxophones.