This is only a guess because I don't have time to research the answer, but I believe that this mark is a commercial barrel proof that is found on pistols that were reworked under contract by civilian businesses like VONO and ANSCHUTZ...
Someone who has Jan Still's Reference Books in their library can probably research this pretty quickly...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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