Polyphon was antique pre-vinyl era music box, used a perforated brass disk. Unlike vinyl LP, polyphon disk contained only one melody, it was a single with no B-side. Like modern music boxes, polyphons were placed in saloons, restaurants and other public rooms. This model represent a polyphon with movement and brass disk in high authentic level. If you would like animate the model, remember, brass disk has slow rotation speed, not like vinyl 33 1/3.