Date: 1970. Owner unknown
The 60H is essentially the same as the 62H, except that it has a single rotor attachment. As on the 62H, the 60H has the tuning slide in the hand slide. The advantage of having the tuning slide in the hand slide is that this allows the entire bell section to be conical, in stead of there being a cylindrical section to allow for the tuning slide. The 60H has a red brass bell (or "rose bras" as it is called these days). The 60H was produced between at least 1968 and 1972, and was probably discontinued sometime between 1973 and 1980. In a 1969 ad featuring the 60H, 62H, 71H and 73H, Conn says: "We have just created the 4 finest bass trombones in the world...".
What Conn said in the 1970's:
Red brass bell for darker sound. Special tuning mechanism in slide. The 60H has F rotor with E pull, plus full 7th position for complete chromatic range to pedal Bb. Using the overtone series of each valve note gives the player use of two horns in one: Bb and F. The combination of extended low range and use of the F horn overtone series, as alternate positions, gives this instrument great flexibility. Lustre-Conn finish over polished brass with nickel trim. Bore 0.562". Bell diameter 9 1/2". Length 46".