Interesting discovery Hugh...
I can't wait for someone who knows the answer to educate us on this one... could it be some kind of inspection mark during manufacturing? a manufacturing batch # identification or possibly an indication of heat treatment or hardness?
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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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