What is this knife?

[melchior]

Hello

I have this knife from my uncle. Its a fixed blade. On one side is written
U.S.N.
M.K.1

on the other side is
Robeson ShurEdge
No.20

could anyone tell me about this knife. Thanks for the help.

 

[sven56]

It's a WWII era, US Navy issue, Mark I combat/utility knife.