I have two Conn 73h Bass Trombones for sale. One is an Elkhart the other an Abeline. Both are dependant with Extensions on the second valve to make then Bb/F/D or Bb/F/E .562 bore, 9.5 inch bell, in honest used condition. If your looking for a quality Double plug bass trombone that wont break the bank and that will increase in value these are worth consideration.Send me a pm if your interested. Thanks.