New to me M1

[jasonafair]

I just got this and any input/information would be appreciated.
What I think I know - Receiver either Dec44 or Jan 45 depending what list I look at
Barrel Nov 51
Past that, I have no idea what is "correct".
I included some photos because I don't know if I'm looking at a proof mark or a bad tool mark.
Thanks for your help.

Information

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