These tenors are rare instruments, By switching the B's and Bb's, and having Db's instead of D#'s alongside the D's, they enable you to play a fifth below a treble, but with the same fingering. (For a fuller explanation, see this thread.)
This one has just emerged from a comprehensive restoration, with new pads, valves, springs, bushings and straps. The woodwork has been stripped and French polished, the bellows re-bound, and the reeds tuned to modern concert pitch. (No case, I'm afraid.)
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