There used to be a nice article narrating the story of ED glass on Nikon's website, but this article got removed when the site was upgraded some years ago (progress takes us backward sometimes). The new history page has a short snippet with very few details.
Thanks to Internet Archive we can still obtain the longer version of the story:
It is well documented that Nikon initially used Schott FK-50 in some of its Nikkor lenses. These include:
Details regarding this glass type has not been available, however recently the full data was obtained from an 1968 Schott Glass Catalog 3050e . This shows that Schott had already created this type of ED glass around 1966.
Nikon was one of the early adopters of the ED glass. Although according to the history article above, Nikon started to work on creating its own ED glass in late 1960s, the manufacturing did not begin until around 1974 it seems. Hence the initial use of Schott FK-50.
Unfortunately Nikon never published its glass catalog. The only reference to the Nikon catalog I have found are in the German Patent DE2163430C3 – but this was pre PC102.
We can observe following from the published patents from Nikon.
The PC102 glass had nd=1.50032 and vd=81.9.
We do not have any other details. Overtime this glass appears to have evolved to the modern Hikari J-FKH1 which has nd=1.49782 and vd=82.57.
We can perhaps trace the history of Nikon's ED glass journey by looking at early Nikkor patents.
Nikon was created in 1917 mainly to make optical glass instruments. Very soon after Nikon started making optical glass in Japan. But Nikon never sold optical glass to others as far as we know, and did not publish their glass catalogs.
In 2004 Hikari Glass Co became a subsidiary of Nikon.
The earliest catalog from Hikari Glass that I can locate is from 2002. It shows that at that time Hikari was making E-FKH1.
The question is how and when did Nikon's optical glass manufacturing transition to Hikari? Perhaps it occurred before Hikari was fully acquired? Perhaps for some time Hikari was contracted out to make optical glass exclusively for Nikon?
I think we would all be interested to know the history.