Olle..The metal looks pitted, rusty..maybe re finished. There are cases where these Military acceptance markings are struck light but they might have been buffed at one time. Hard to tell from extreme closeup photo's. Back off just a bit and show a photo of the side..close but not as close!
The circle N on the lug is an unknown inspection mark.
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Jerry Burney
11491 S. Guadalupe Drive
Yuma AZ 85367-6182
l ugerholsterrepair@earthlink.net
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