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Uploading a couple more screengrabs.
There's the beginning of the side in which you can more or less tell that the signal is quite loud and the END of the side where you can appreciate the harmonics. The lowest frequency you can see is about 4.5 KHz and the harmonics are every 900 Hz (5.4, 6.3, etc.) although to my ears it sounds as a 1 KHz carrier signal.
Would it have been possible for this to be also a cassette master? you can hear the typical low frequency tones at the end of every side on a cassette used in normal duplication machines.
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