"Sousaphone"

[TheDoctor]

Appears to be in BB key
https://www.ebay.com/itm/265739230951?c ... 1&mkcid=28

[iiipopes]

Reminds me of a mutated amphibian that hatches occasionally.

[arpthark]

double bell euphonium

[bloke]

I would recommend buying one of those American-made replicas of vintage American sousaphones for $12,000

[matt g]

Dr. Seussophone.

[arpthark]

Dr. Seussophone.

I showed my wife and she said "it looks like it belongs in Whoville!"

[donn]

This isn't a new development. Such instruments must be manufactured with some regularity, in far off India. Perhaps required by some school band programs. I don't know, do we have even anecdotal evidence that it doesn't work? Maybe they've hit on the modification that makes the otherwise reportedly useless tubas equipped with this valve section into real players. And gold plated, can't beat that.

[arpthark]

There are videos on YouTube of people playing the single-bell, er, variant.

It is a tenor sousaphone, pitched in the same octave as a euphonium.

Intonation is remarkably, remarkably bad.

I do not know what one would ever use this for, unless playing some 43-tone Harry Partch music or as a torture implement.