Any Thoughts on this Extractor?

[Jersey Devil]

While digging through a bag of my spare extractors looking for a replacement for one of our patrol M14s, I came across this unique example (see pix). I posted these photos in a thread on the M14 Forum (see https://m14forum.com/m14/497302-any-...ml#post4451786) and received some interesting info. I figured I might as well share it here on my forum because I believe it's something unique. Maybe not "special" per se, but unique for sure. If anyone has any info on this interesting and unique marking, please share it here.







Thanks, and Happy New Year!
--Brian