* The S prefix, while used until the mid-80s, was not always seen on serial numbers. The Conn-Selmer resource guide appears to leave out the S prefixes on its serial number list, deduced from an observation made here: http://forum.saxontheweb.net/showthread.php?158653-Conn-Sax-Serial-number and http://www.trumpetmaster.com/vb/f139/conn-18b-53120-3.html#post555667