If it's a Conn trumpet, it's the model number. The Conn 20B is a student model horn.
I think the value of your trumpet depends more on the model of your trumpet, how old it is and of there's any dents or if any part of your trumpet docent work.
The brand and model number, as the serial number is unique to the individual instrument.
suck a trumpet then you will find out. believe me then you will find out
Impossible to say without the serial number
They're usually on the bell or on the 2nd valve casing (the outside part of the 2nd valve)
There is no trumpet fool
I play trumpet and have it if you want it.
Bach trumpets, in general, will be good trumpets. The Omega is sometimes considered an "intermediate" level trumpet, providing a stepping stone between a beginner horn and a Stradivarius professional trumpet. Basically, the Omega model will be a good trumpet for an advanced student who is ready to "move on" from their first trumpet, but may not be willing to spend the money for a professional quality trumpet.
He plays a Flip Oakes designed "Wild Thing" trumpet.
As with most major manufacturers, new Bach Stradivarius trumpets retail anywhere from hundreds of dollars to several thousands of dollars. The value of a used trumpet will depend on many things, including the trumpet model, its age, and general condition. None of this can be estimated based on a serial number.
There is a picture at the website below with the 7 locations to check to find your model number.