Check it out; they’ve made some interesting claims about the genealogy of various Pentel pencils (but I can’t really make sense of it all).
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so those diagrams were shown at an official presentation of the orenznero? i am too less deep into pentel to detect strangenesses, but i am sure nimrodd will do 
there is also an image of the 0.1mm prototype in one of the links. i don’t remember if it is the photo i have seen before or another one.
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This is fantastic. It took me a bit to get the years, but once I hit image 3 and saw the S63 flow into H1, I figured Showa era and Heisei era, so I can convert those to CE years.
I have seen something similar before, but I don’t believe it was this comprehensive.
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And some dates appear to be off a bit from the official timeline. For example the P1035 (Kerry) shows to have been released in 1972 (Showa 47 +1925), instead of 1971, which is the “official” release date and what is marked on the pencil.
The Rolly’s are listed on here, as are the Renoma pencils, which are a lot older than I thought, starting in 1985. The Person’s Collection is listed as well, starting in 1987, with the PQ6 coming out in 1990.
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Some of the images from https://digitallife.tokyo/archives/2017/02/pentel-orenznero.html link to Flickr images that can be magnified as well.
There appears to be some good information from this page as well: https://monosukiblog.com/orenznero_20170217.
This might be old information to some/most of you though
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This is a really interesting and at the same time frustrating timeline. Too bad there is so little in the S35-S45 time period.
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