Miyajima overlooks the Microgroove pressing altogether.
?? Miyajima mono carts come in both .7 and 1.0, what did they overlook (miss?)
Mono Cartridge Stylus
So a while back there was a thread about mono cartridges like the Miyajima. There was some confusion about stylus size and what should be used for mono re-pressings versus the original mono pressings.
So Miyajima claims that their 0.7 stylus is optimal for modern mono re-pressings and that their 1.0 stylus is for those earlier mono pressings that began in 1950. Columbia introduced the Microgroove pressing in 1948. The Microgroove pressing offers 300-400 grooves per inch and AI claims that the correct stylus for these pressings is 0.7. I will say that I don't believe Miyajima to be entirely wrong, as there were labels that still used wider grooves however, I believe nearly all of the major labels eventually adopted the Microgroove band width thus making it the norm by the early to mid 1950's.