| Kevin67: I own an identical horn. Ser#44123. It has a pat. date of 1910 on the high/low pitch change over.
I date it at 1913 (c.1915)
Kenton: I have a York Eb tuba that has a change over too. It is a slide that can either be just a loop outside of the horns air passageway, or it can go into the tuning slide outer tube and be incorporated into the passageway.
Problem with the tuba is that it is either a bit over 440 at the lowest high pitch setting, or a but under 400 on the low pitch setting. I keep threatening to cut off some tubing (but have not done it yet.)
Pryorphone: Low pitch can be as low as 435. (see that CalState site) My Conn double bell baritone (1907) was built to 435, and I remade new tuning slides for it new rather than cut the horn!
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