Here's some threads about these markings... Most of this has been discussed at some point here, easy to find.
https://www.milsurps.com/showthread.php?t=31874
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Type: Posts; User: browningautorifle; Excluded Forums: Milsurp Knowledge Libraries (READ ONLY)
Here's some threads about these markings... Most of this has been discussed at some point here, easy to find.
https://www.milsurps.com/showthread.php?t=31874
...