This is a single valve bass trombone from our historic collection; it is not for sale. This is a Bach 50B with a custom rotor and F attachment made by Larry Minick. The tuning slide, trigger linkage and E-pull stop are by Zig Kanstul. Garish gold lacquer also was done by Kanstul but it faded to this color over time. This rotor blows straight through on the Bb side, making it the most open bass trombone design around. This rotor is not related to the Lindberg rotor - it turns the other direction.