TubaForum.net

https://southbend.craigslist.org/msg/d/ ... 65642.html

This is right near my neck of the woods.

Looks cool, too expensive for me though.

Pretty cool none the less.

First time i've seen a (mostly) top action piston horn with tuning slide where rotary tubas usually put it.

I speculate it is for the 4th valve (or more accurately, the +1)