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If audio tape is allowed, my oldest pre-recored tape is from the late 1940s.
It is a paper backed tape. IIRC, it is half track monophonic and is square dance music, including the caller.
I acquired it the early 1960s, with I with the acquisition of a portable Webcor half track bi-directional recorder and a Brush half track portable recorder, both 7 inch reel machines.
I had a spool of magnetic wire for a wire recorder, but I am not sure that I still have it.
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