1. 

   physics-fan3.14 You got any more of them.... prooflikes?

   That area under the chin is known as "strike doubling" or "machine doubling." It is incredibly common, and is not true doubling. Notice the characteristic flat, shelf-like, shiny appearance.

    

   physics-fan3.14, Aug 5, 2016

   #21 + Quote Reply
2. 

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