TubeNet

The valves look like Berliner pumpen.

There's something similar pictured here:
http://www.music.ed.ac.uk/euchmi/ucj/ucjth10.html

It's identified as "Baßtuba in F (C.F. Zetsche Söhne, Berlin, probably 3rd quarter 19th century)"

Also a couple of different Barlow F tubas and a Boosey C tuba.




Christian