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I've never seen one quite like this before, it looks like a giant Cerveny 651. The bell reads "Bohland & Fuchs, Amati-Graslitz
https://www.schneideruwe.de/basstuba#DTESBF4V




The description is:
6/4 Eb - Kaiser-Tuba Bohland & Fuchs Graslitz, 4 valves
For everyone who reads the treble clef or Eb part .... 4 cylinder rotary valves, approx. 20mm machine width, 50cm (19.6") sound with ring; about 108cm long. Nickel-plated brass, unpainted. Original state. Crafted in an authentic tradition in Bohemia

I'm assuming it's Amati built, anyone play one of these before?

Nice! Interesting spit valve location though, and none for the 4th valve. I'm guessing some nice acrobatics are needed to drain condensation.

Mark Finley wrote:Most Cerveny rotor horns are like that. You just lay the horn in your lap to empty the Spit, and in 30 years of playing them, I've never had water accumulate in my 4th valve once

I wish my Eb was a Cerveny. Well ... maybe not, but that dry 4th valve would be nice. Wonder how they do it.

Donn wrote:I wish my Eb was a Cerveny. Well ... maybe not, but that dry 4th valve would be nice. Wonder how they do it.

That bend and the ascending portion with the tuning slide at the top probably causes most condensation to happen there, and flow back into the valves.