If I had to venture a guess ( and only a guess) if it turned out to have a legit USMC connection, it would be that some unit shooting team or recreational range at a base procured the pistol and stamped it for easier identification. Back in the 50's &60's almost every base had a rod and gun club range with loaner guns and many units had unit competition pistol teams. I highly highly doubt this would have been any sort of combat issue weapon
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