Okay, here's another gun to add to the database. Odd thing about it is, although the external condition shows some damage to the nickel finish and buggered screw slots, the darn thing otherwise appears unfired. The bore, chambers, cylinder face, and recoil shield are all pristine, and it's as mechanically sound as a brand new gun.
Now I seem to recall reading somewhere about Marines fighting on the Pacific islands recovering these guns in like new condition. Until just now, it never occurred to me that my NM3 might have been one of them, but now it kind of makes sense.
The lanyard and the markings inside the frame look practically identical to those Fredcoyote posted.
Okay, wow. Next step I guess is to do what I've been putting off for 10 years: get it lettered. Not sure how long it's taking these days, but I'll get the form sent off pretty soon, and when I get the letter, I'll hunt down this thread and update it.