TubaForum.net

no name on it- maybe the bell was replaced at some point. Wrapped something like an Alex:

https://www.ebay.com/itm/135725019949?m ... &recoPos=2

That bottom bow cap is interesting. It looks like it's either two pieces, or just a big patch going up the side:

I'd say a big patch- maybe to reinforce an area badly damaged by a "young scholar" as @bloke would say.

This ferrule is pretty interesting, too.

I'm not telling anyone else what to buy or what not to buy blah blah blah blah blah.
Outside of patches, clock spring linkage is a non-starter for me.
It's usually rattly and not something that I want to use either in practice or in performance, and it dates the rotors as well...
I'd say half the time you end up with a tuba with good rotors with those types of levers, but the other half the time you don't.

My stab at a maker is Schuster.