Flickr doesn’t like how big the pamphlets are (over 10 MB), so I will be uploading them to my twitter account.
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Is it true that the Hi-Mechas are the world’s first double-knocks? I have no possibly older specimen in mind, but generally those “first” claims tend to be not always so completely true …
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Excellent!
If you can spare one to sell or trade, let me know. 
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You make a good point. I think it’s safe to say that PILOT made the first etched steel grip double-knock mechanical pencil. If only we could confirm the actual release date.
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Pieces in contention for the title of “oldest double-knock:”
- Pilot Gentleman Young
- Pilot H-2003/5 (I think this precedes the H-1003/5, but not certain)
- Mitsubishi W-knock
- Mitsubishi stainless steel double-knock family
- Ohto Grip500 and its white-labeled minions
Possibly in contention:
- Pentel W-knock
- Pentel PSD5/PWP15
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Digging through patents will probably give us who the real first pioneer is.
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Pilot-inside contester can be left out, I think, but Mitsubishi W-knock might get interesting …
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Lemme know how that goes 
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Gentleman Young is allegedly early 70s…
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Yes, we need the twitter guy here who loves digging in old pencil patents 
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Also confirms that the Protex is from 1984. Wonder how long they made it for.
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Where do you see an indication of 1984? I ran Google Translate and I didn’t see it.
‘S60. 7’ on the first page bottom right corner = Showa 60 July
H prefix = Heisei era. Current era is R = Reiwa.
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I’m not very familiar with the Japanese era notation.
Showa period was from 1926 to 1989
So, is “60” the number of years into the period? 1986?
Yes, add 1925 to the Showa Era #.
For the Heisei era, add 1988.
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When in doubt, just Google ‘Showa 60 year’ etc. Instant answer.
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Thanks
