I’ve got bunch of records from my father and couple of them r pretty old late 40s-50... those two records are made on some much heavier vinyl also the flexibility of those discs is far from modern LPs. The vinyl looks more like bakelite, it chip off easily. I tried to play those records ones but unfortunately I couldn’t even hold one truck so noisy clicking and popping it was.. washing and cleaning did not made any difference... the records just unlistenable.
@surfmuz are you talking about 78rpm gramophone records you tried to play with a wrong needle on the wrong turntable on the wrong speed ???