Don't get too excited about that horn.  The serial number puts its manufacture date in 1956, a year or so after the Conn Artist horns were cheapened considerably.  Their sound is more akin to a Director student model than to an earlier Artist horn.  They're essentially Directors with more refined keywork.  Conn sold their Artist horns for about 30% more than their student horns during the late 50s and I think that's a fair benchmark.  About $500 tops and nothing to dump your Serie 2 for.