Wow these old Conn's are cool!
This is what is known as the New Wonder Series II alto.
A customer brought this horn in for repair, a play test showed that it was basically playable but stuffy and hard to hit the low notes. The pads looked okay but the neck was loose and obviously leaking.
I was able to get this horn going pretty well by re-fitting the leaking neck (expanding the neck tenon), then a full adjustment/regulation of the instrument which included re floating/seating some of the pads.
The hallmark of these horns is their sound! Its absolutely huge! This horn really sings and is easily one of the better horns through the shop in recent history.
Note in the photo the mouthpiece that was in the case, an old Otto Link 4 start model, which is really cool! We found that it played ok with the horn but in the end it was decided the horn really played & sounded best with an old large chambered hard rubber mouthpiece.
Hope to see more of these! I have a few Conns here to overhaul but no New Wonders. I'll have to be looking out for one to buy!