Came in 3 types--rumbler, team, decorative brass. Rumbler (Such as you have located) are hollow spheres, usually made of brass or Iron, which are cast with a small ball of iron loose inside. Their name comes from the distinctive rumbling sound produced by the movement of the horses. Team bells are of the open mouthed, clapper type. Each horse team is fitted with a rectangular, leather coverd frame that is mounted on the hames. As many as Five bells are suspended from the frame. The bigger the bells, the fewer are fitted to the frame. Decorative brass harness bells are generally smaller and sometimes incorporated into fly terrets. Unlike rumbler and team bells, brass harness bells are intended for show at plowing contests or in the show ring. Slightly larger decorative brass bells known as chimes are also produced for mounting on the saddle.Harness bells were a practical necessity on the narrow roads. On many country lanes, space was insufficient for two vehicles to pass. The warning provided by the bells would allow wagoners ample time to find a wide spot to pull to the side, Thus avoiding the difficult task of backing up the wagons...Hope this helped a little....PAPPY
