C. G. Conn double horn

Hi! So I was hoping someone had some additional knowledge about my horn. The bell reads "C. G. Conn LTD Elkhart-Ind USA" I did a bit of research and I believe it was in fact made in Elkhart rather than Abilene. The serial number has an "N" prefix and I read that the N series was one of the latest Elkhart made horns. Does this sound right to anyone and or does anyone have any additional information? Maybe what a horn like this, in good playing condition, might run for?

I believe the n was made in 1970. I have a m model and love it