Review: Pentel Mechanica 0.3 & 0.5 mm drafting pencils

Pentel has been making writing instruments since the 1940's.  But 1968 was the big "break out" year for Pentel.  This was when they released the Mechanica.  2018 was the celebration of their 50th anniversary.  Alas, no re-issue was made.  But it did indeed cause a spike in resale prices of the original mechanical pencil.  So…

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Review: Pentel Mechanica 0.3 & 0.5 mm drafting pencils