This is a Robeson Shuredge No. 20 classic utility and fighting knife issued to the U.S. Navy (USN) during World War II. Known as a Mark 1 (MK1) utility knife, it was a vital tool for sailors and naval aviators for both everyday tasks and combat.  It comes with what appears to be its original leather sheath.  
The end of the handle of this knife is missing, as can be seen in the pictures.  
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