This is a very rare Conn Super Bone made in the late 1880’s/early 1890’s at the Worcester Factory of Conn. The instrument has 2 serial numbers, one for the slide and one for the valve section. It seems that when Conn started the factory in Mass. he used a different serial number system for the slide trombones, as noted by other slide instruments that have been seen from this period. This trombone does have some wear on the silver, but is in generally good shape. No case or mouthpiece. Will need some restoration.