Ed1 said, "the pitch of all three sizes is usually the same"
It is today. As noted above, it wasn't originally.
Yep, I read your first post and thought that might be it - until Chris wrote that he read a uke book written in 1910 that was written for C6 and that not until the 20's or so did the D6 start up. So, I'll keep both ideas in mind as I learn more.
BTW, I'm not much of a tenor player, but tuned one of my tenors to Bb6 and found I like it (both sound and playability) and will keep it there. I never thought of doing this before your post.
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