Just cleaning out a 1940 Conn 10m, and suddenly I heard a crash. I shook the horn, and out pops a mouthpiece and ligature. It says "Steel Ebonite '36 The Woodwind Co NY" and on the back "K6". Does anyone have any info on this mouthpiece? Are they any good? Unfortunately, I can not play with it right now as the tenor is not in playing condition.