i have a clarinet that was handed down to me by my late greatgrandfather who was a drum major at baylor university during the 1930's or 40's. ive been trying to find out what type or model it is but have not been having much luck. i brought it to a professional (my private lesson teacher) a few years ago and even she couldnt really specify what type it was. i have noticed that it has many extra keys compared to the Bb saprano that i play on currently. there is also a buffet mark on it and a serial number: 1427. if anyone can help me identify this instrument it would be greatly appreciated.