Welcome to the forum!
We have some smart folks here, but that photo is a bit skimpy! I'd guess some form of a Besson compensating tuba.
Dave Werden (ASCAP)
Euphonium Soloist, U.S. Coast Guard Band, retired
Adams Artist (Adams E3)
Alliance Mouthpiece (DC3)
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Dave, Thank you for your input.
I second that.
DG
Thanks, DG.
What tips you off that it's a Besson?
William,
Can you tell us why you are asking about the horn? Where did you get the photo?
Dave Werden (ASCAP)
Euphonium Soloist, U.S. Coast Guard Band, retired
Adams Artist (Adams E3)
Alliance Mouthpiece (DC3)
YouTube: dwerden
Facebook: davewerden
Twitter: davewerden
Instagram: davewerdeneuphonium
Looks to be a comp tuba. Could be either Eb or BBb but cannot be told due to the lack of other details. Due to the bracing I am almost sure It is a Besson.
Some stuff
Thanks Josh. So the bracing is the tip-off that it's a Besson. That's what I was hoping to find out.