I've got a safety that is marked WRA, the tooling marks look like a chicken bit it off, However it could be a Garand safety. It is my understanding that they are interchangable, I could be wrong though.
Lee Emerson's "M14 Rifle History and Development" lists the safety as one of the M-14 parts made by Olin Mathieson ( i.e. Winchester) but I've never seen one.
Back when I was putting together some trigger groups, most of the people that I talked to said that "OM" marked M-14 safeties were "scarce as hen's teeth" and Winchester groups would commonly be seen with "K8" marked safeties.
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