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58mark wrote:That is very interesting. I wonder what the bore size was of those tubas?

I find it interesting that these older catalogue listings almost *never* mention a numerical bore size. If there was ever any mention, it would be something non-specific, like "large bore", or something like that.

Was information like this less important to our tuba-purchasing predecessors?

(My guess is it's more about "brand loyalty" ["my dad bought nothing but Chevrolets"], and they trusted their brand to give them a bore size comparable to the horn they were purchasing, no questions asked.)

Something I have not seen in Miraphones--actually, any tuba--is the placement of the spit key up the vertical tube. I wonder if it was meant to keep spit from dumping on our lap?

I've also seen that on some MW rotary valve tubas

It's for dumping spit while the rest of the group plays and you sit there (assuming the horn is for orchestra). I do this two nights a week now.