the first mm 10 inch set

I skipped mm559 and m610 in the last post, I am not sure why. I don’t understand why Columbia started numbering the sets mm instead of m. they fit in with the m series, and the 10 inch and 12 inch still have the same numbering system. Here are four more Steinweiss 10 inch 78 rpm sets, 1946 to 1947.

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2 Responses to the first mm 10 inch set

  1. Paul says:

    Columbia Masterworks M-sets were manual sequence, and MM-sets were drop-automatic sequence, with many albums available in both formats during the early 1940s. M-sets became rarer in the late 1940s as drop changers gained in popularity through the decade.

    • recordcovers says:

      thanks! I guess if I were a fanatic I would want both. But I don’t have enough space for the 78 sets I own, so I will have to content myself with whichever one I have.

      Thanks again, Ken

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