U1 type receiver element for Western Electric G1 handsets on 500 series telephones. Also works well as a replacement for all your old telephones as a receiver element. Can be used in candlestick receivers for clear sound. Can be used in any old receiver were there is space.
Has 2 terminals for your 2 leads so it would be an easy transition.
Many use these for a clear easier to hear modern replacement in all old phones.
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