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Herr Brandstoetter (of Mnozil Brass) seems to have a "new" tuba (don't know if it's new or vintage -- and just "new" to him). He seems quite happy to have found it. http://www.mnozilbrass.at/318.html

I'm assuming it's an "F" -- but what brand and model?

Danke schoen,

That is a strange rotor layout,the way they are staggered.It does appear to be true love though.Even I have never spooned my tuba

what's a possible advantage to the valveblock layout??

Banff, probably??