I have a lovely blue Ortofon MC20 here that was bought by a mate in 1977 (the year these were released), along with the MCA-76 (what we used to call a pre-preamplifier or head amp). These items were available separately, or the combination could be purchased in a single big white and red Ortofon box with big window on - some will recall the latter as a very purposeful looking sight in a dealers display case!
After the last discussion on here about cartridge/suspension life, I decided to give the old blue thing a go. Being an Ortofon, the MC20 outputs a mere 0.07mV (@1000Hz, 5cm/sec) on its own, with the head amp upping that to circa 5mV before going into a standard MM input. I have an old LK1 here as MC phono stage, which I suspect wouldn't quite cut it with such a low output cart. I needn't have worried, as, through the purpose designed MCA-76 (CD-4 filter off), the sound was absolutely lovely all the way to the lead-out grooves of a half dozen or so record sides. The tip is (or, at least was) a 40 x 8um nude fine-line, and really sounds none the worse for wear. Apparently, my friend had chopped and changed between various cartridges, all of which have landed in my spares box. Time and opportunity will tell how well the best of Empire, Grado, Shure, Stanton/Pickering, and a few others, have fared over these many decades within a still ever so slightly fragrant cigar box.