Conn moved much of it's STUDENT horn production to the former Best Manufacturing plant in Nogales AZ as early as 1959/1960. These are often erroneously referred to as Mexi-Conns, but it is actually the later, 1969/70 and later horns that were actually made in Mexico, and as Swingstreet mentioned, have them stamped as such. With the N before the serial number, yours is a later, 1970 Director model, however by this date it doesn't really matter whether it was made in AZ or Mexico, as all horns of this date are relatively poorly made and not anywhere near the quality of Conn's golden years, Student horn or otherwise. They aren't generally well regarded mechanically (the keywork is clunky, goes out of adjustment due to sloppy fit and finish and soft metal, and overall assembly is poor), and our valued accordingly quite low monetarily. Conn's "Artist" line of horns (i.e. 6M/10M/12M/ etc.) were never made anywhere but Elkhart straight up to 1970 or so, when production of these pro horns was discontinued.