Yes, I admit it: I am a bit stumped on this one:
eBay: Vintage C.G. Conn Bb Trumpet (item 140108472904 end time Apr-23-07 19:35:56 PDT)
Built in 1929. It is almost certainly a "New Era" trumpet, either a 56B, 58B or 60B. However, none of those fit this instrument.
The 56B has the rotary valve to A like this one does, but also an automatic 3rd slide/trigger mechanism by pulling the 3rd slide ring. This one doesn't.
The 58B is a "plain Jane" version: no rotary, no automatic 3rd slide.
The 60B has the automatic 3rd slide, but not the rotary to A.
This one has the rotary to A, but not the automatic 3rd slide. Which makes, I guess, an unusual 56B? Anyone seen one like this before?
Regards, Christine