(click on pictures to enlarge)

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This one is marked only on the cap:  "Fox Permagraph Patd. Fox & Fox N.Y.C. 14k Gold Filled."

Other than the barrel construction, which includes the brightly colored bands, there's not anything mechanically unusual about this pencil; it is a typical nose drive piece from the 1920s.  I have not yet been able to track down the patent, so research on this continues.

 

 

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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