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I just saw a show on PBS that discussed these. I believe that it was as Polaraman said-an audio recording made by an amateur. Doing this was popular in the 1930s or so.
I used to have some radio program recordings of Methodist Church radio broadcast sermons that were made in the 1950s. These were on extra large red vinyl records that would have required the special radio station players to listen to. They were about the same size as the aluminum record in the auction. After contacting the Methodist Church about them and finding that they were interested, I sent the records to them.
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