This One Elevated My Understanding

A couple weekends ago, I introduced an "unmarked" calendar pencil. Using my powers of deductive reasoning, I had concluded that my pencil must be a Dur-O-Lite:

Soon after that article published, my friend John Coleman emailed me to let me know that he also has a similar pencil . . .

To learn more, this full article is included in The Leadhead's Pencil Blog Volume 3, available at Amazon, Barnes & Noble and everywhere else you buy books, or you can order a copy signed by yours truly through the Legendary Lead Company HERE.