Fun story: in childhood I played with father's vinyl and reel-to-reel magnet tapes. They had different recording speeds and typically I could easily guess which is correct by funny singer voice. Until I discovered Jean-Michel Jarre -- I had listened for hours, but haven't been able to figure out which speed was the correct one.
It would seem at some point that even manufacturers of contemporary turntables forgot (or just don't care) about this, I've seen multiple turn tables with trimming potentiometers, lacking the speed indicator and strobe, and I've put off buying, because.. gee.. how am I going to trim it without them.