TubaForum.net

https://www.ebay.com/itm/286193008009?_ ... R8jHooLxZA

No good pics, but here's a rear shot:

For some reason, there are two sellers in Japan selling the same instrument. Regardless, here's a front shot from the other seller:

The other listing says piston. Heh.

Something I like about the B&S rotary CCs is the ability to insert a slide extender in the fifth valve tubing to give you the long 2-step length. The extended tubing snakes all the way down the length of the valve block. It's a pretty clever design. I had that for my PT-6, but preferred the shorter length.