We recently purchased my son a new (old) Horn. Based on the serial number, we know it's a 1973. It's a Holton Double. How do you determine the model?
Thanks in advance!

Usually on the mouthpiece receiver there is a number stamped right below the ferrule. I had a Holton as my student horn forever until a teacher (who will remain nameless) said that no matter what, I must play a Conn 8D. That thing haunted me. Finally sold it, still have the Holton, but the valve job would be a little bit to repair it, especially since I've got two pro horns now. Hope he enjoys it