The WS-75, 80, and 85, are all the same but designed for different violtages (maybe). They came into use about 1935 and ran until 1948. They were replaced with the plastic whistles. There were changes over the years. The earlier versions held the sound box cover on with screws, instead of drive pins, and are much easier to work on. Some early versions used a self aligning bearing that works well, but is no longer available. Also several different impeller designs were used. This is the box shaped whistle that Chuck refers to above.
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