I obtained an old Selmer US trumpet with the serial # 4072. I have done many searches, forums, local vintage trumpet stores, etc. to try to narrow down more about it or it's value. So far, it's been confusing to pinpoint. Many seem to think that it may be an Bundy student model, yet are confused by it's fancy engraving & 'S' hooks. The serial number appears to be an early one to the others i've seen from the Indiana, US Selmers. I have not seen any Bundy student models that resemble this one. There is no other numbers or names other than Selmer US (on the case & bell) & the serial number. Any help?