The pistol I refer to is the real deal. I own a few. I guess the specific question to ask is if the Marines stippled the front strap of there match pistols. I own enough NM pistol parts to be able to compare the parts of a regulation NM 45 pistol.
When the Armory was open, a school for armorers was conducted to teach them how to rebuild 1911 A-1 Pistols. When the armorers returned to there units, the pistols that they rebuilt were not stamped SA on the slide. Also, such rebuilt pistols lacked the front strap knurling of the later date rebuilt pistols. The Armory had a special milling machine set up to knurl the front straps only. This information was garnered from an engineer who worked on setting up the project. The sear adjustments on these NM pistols are unbelievable. No creep at all.
Genuine NM pistols are a priority collectors item.
I hope someone down the line comes up with a definitive book on NM 1911 A-1 pistols.
There isn't a whole lot of accurate information on NM pistols. I checked my Clawson book, and he doesn't go into NM pistols deeply.

Thanks jmoore for your input.

SJDE