right or wrong the market values this kind of horn very little
True. A BETTER instrument that their market values suggest.
C prefix= 1964. Nogales, AZ.... as Hassles notes.
As a player, a pretty good horn. Good intonation, free-blowing, well made, really nice tone. Ergos and key action are quite OK.
But they only sell for perhaps $300 in good playing condition. So, usually, a 'keeper' as opposed to a candidate for 'flipping'.
If not in good, serviced playing shape....worth perhaps $90-120 here is US.