Conn 50H Director Bass with F rotary attachment
Date: 1967. Owner unknown
The 50H Director is a student model bass trombone. The 0.522" bore makes it a #3¾. It was produced from 1965 through at least 1973.
What Conn said in 1966:
Outstanding bass trombone designed especially for students. Acoustically superior. F rotor attachment. Bore size
.522". Bell 8½". Length 46¼".