Basically a Cerveny Arion, fun little horns. Basically a BBb Piggy with slightly smaller bore (.795"). Looks like it has upgraded miniball linkage instead of the old ball-and-socket stuff.
Frank
Principal tuba, Bel Air Community Band
Old (early 1900s?) Alexander BBb proto-163
1976 Sonora (B&S 101) 4-rotor BBb
~1904 York 3P BBb Helicon
Old Alex Comp.F, in shop