W - My C-Sops - Martin (stencil) is 22", and the Conn (also stencil) is about half-inch more. Both LP, both to low Bb. There is a little variation in overall length, seems relative to bore size.
Bb Soprano's tend to be over 24" - the only real area of confusion is HP Bb's or old Bb ones only keyed to low B-nat - so a HP Bb Soprano only keyed to low B-nat can cause confusion, thankfully they don't appear very often...
i had an old Modele 26 Selmer C pitch soprano that was about 57cm long. If memory serves, the Series III Bb sopranos are 65-ish(?), so there is a noticeable difference in length. Plus, the different proportioning of the keys/tone holes as you work your way down the horn is easy to see.
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