The two tone is stamped Colt 45 Auto. 4 of the others are have letters stamped.Very nice pistol. That 2-tone mag might be correct for that 1933 pistol. From an old 1911 thread on this subject:
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By “marked” he means “Colt 45 Auto” stamped on base plate.
I have the 1970’s version of that NM and it’d probably be the last one I’d sell.