I have in my hands a Charles Bay soprano mouthpiece with the marking O-L H1644 hand engraved on the side. It is in a tube marked with a gold foil label: ARTIST QUALITY BAY-GALE MOUTHPIECES FOR CLARINET AND SAXOPHONE CUSTOM - MADE BY CHARLES BAY I slapped a reed on it ind it plays quite nicely, if a bit mellow for my tastes. It belongs to a friend and he wants to know what there is to know about it. The original price sticker on the tube is for $40.00 - hand written. The cork is good, engraving sharp and fully colored - white. It has been played, but it is not chewed on at all, and a disreputable dealer could buff this and sell it as new - vintage. Facing is clean with no nicks or other marks. What do the engraved markings mean, and how much might this be worth?