I have a Dave Guardala MB mouthpiece that I haven't played in years and while doing some research I notice the prices have really increased on these. Would I be making the wrong choice by selling this since I don't play anymore? I would imagine if I ever wanted to play once again there would be something I could replace it with. From what I can tell this is a 4 digit serial number (hard to read) and with my poor measuring skills seems to have a .108 tip opening. Does this seem about right specs wise? I purchased this back in 1990 I believe.