Dur-O-Lite was founded by John Lynn, one of the founders of Autopoint, sometime shortly after 1925, when a business disagreement led Lynn to sell his interest in Autopoint.   According to promotional materials printed around 1934, Lynn "conceived the idea of a plunger type pencil, with the tip removable from the barel while in active service in France . . . after the war, [he] organized a Company to manufacture a similar pencil, and later designed the DUR-O-LITE, and organized this company." 

This disagreement is the reason early Dur-O-Lites closely resemble early Autopoints, and the reason the two companies remained bitter rivals for decades after.

(click on pictures to enlarge)

durolite 

 Early Dur-O-Lites strongly resembled Autopoints in every respect except for colors and the clip.  The mechanisms were nearly identical to Autopoints.

A few years ago I had a green and black early Dur-O-Lite with a cigarette lighter built into the cap.  Oh why, oh why did I let that one go!

 k

Keenpoint was a subbrand of Dur-O-Lite, as the bottom 2 examples clearly indicate.

However, the top example is a bit unusual.  It is marked "Keen Point Chicago" on the metal top and is identical to pencils produced by National (under the Diamond Medal name, among others).  It is clearly a National Pen Products model.

Whether Dur-O-Lite contracted with National to produce some Keen Points, or whether Keen Point was a stand alone company that was later acquired by Dur-O-Lite, is the subject of continuing research.

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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