Eugene, If you had the model pictured, it was an unusual Westinghouse because it had a metal impeller. Not only did the metal impeller have sharper leading edges to scoop water better and dice food particles, the metal impellers did not suffer the chipping and dulling of the leading edge which impaired the washing action of the Bakelite impellers over time. For some reason, Westinghouse only used the metal impeller in this one model year and returned to the Bakelite impeller for the rest of the run of their impeller machines.