FWIW I have owned six real German Hk 5 round magazines and 5 of them had date codes i.e. ID 7.62x51 marked on them. One had no markings to speak of but appeared to be of the same construction as the others and as it was in an Hk baggie I did not think to question it at time of purchase.
I think that an old Hk LE brochure advertised that the PSG1 shipped with two 5 round magazines, and two 20 round magazines.
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