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I recently bought an old 4/4 Holton BBb with no valves (well, there was a Bundy sousaphone set hideously grafted on).
Being curious as to the similarities between this and the similar York model 33, I pulled mine (1906) out of the case (King valves less hideously grafted on).

Both side by side with bells against the back of the sofa to line them up.
While quite similar (maybe even the same bugle taper), many of the bends (top bow) and the joints (ferrules) are in different spots to be sure.

Bells and bottom bows are interchangeable, that’s about all - even though the taper is very similar.

I think it’s accurate to say that at best one inspired the other.

I have to believe that those “Phillips” tubas - from a couple of decades ago - were fabricated from recycled Holton molds, rather than “the first tuba ever designed by a computer”.

bloke wrote: ↑Tue Apr 20, 2021 7:42 am I have to believe that those “Phillips” tubas - from a couple of decades ago - were fabricated from recycled Holton molds, rather than “the first tuba ever designed by a computer”.

I tend to agree. The cost to retool for a new model tuba would have prohibitive, especially in light of the fact they already had tooling in-house that would do the same thing.