Buescher True Tone straight soprano measurements C vs. Bb

 

I'm trying to calculate the percentage size difference between a Buescher straight soprano in C vs. the same model in Bb.

I have a straight Buescher soprano in C, 188xxx, 1925-26 that has a bell with an outer diameter of 88.3mm, and a total length (without mouthpiece), harder for me to measure, of about 559mm.

I do not have a similar Buescher straight soprano in Bb to compare.

Could some kind soul with a similar Bb please measure their horn and reply with the numbers?  Thanking you in anticipation,
Ken

 

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