Principal tuba, Bel Air Community Band
Old (early 1900s?) Alexander BBb proto-163
1976 Sonora (B&S 101) 4-rotor BBb
1964 Conn 20J/21J BBb (one body, both bells)
~1904 York 3P BBb Helicon
Old Alex Comp.F, in shop
I too had seen that video before and had googled the instrument and thought that I had learnt all that I wanted.
It's reappearance prompted me to look again and I learnt more both from the historic threads and just now from Elephants post.