(click on pictures to enlarge)

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Marked Tripp Barr (with a star in between the two words) on the clip.

These are kind of cool and often overlooked, because they don't hold up very well.  The window in the center of the pencil reveals the chambers in which extra leads are stored.   With the cap removed, you can remove the spare leads. 

Not a very efficient set up, if you have an eraser.

 

 

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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