Thanks for the feedback.Frank Black said: "About two years ago now, I came into an unusual RIA 1903: # 49643.
It has a S.A. barrel dated 7-15, with flaming bomb.
As for stamps, there are the usual ones, such as a sideways 'U' stamped on the rear metal band. On the underside of the barrel, there's a 'P ' stamp, and then on the 'flat' of the bayo lug there's an 'H' stamp. There is an 'S' stamped on the 'snout' of the forend wood (or 'nose'-piece) under the barrel."
I am looking at Joe Poyer's book, The Model 1903 Springfield Rifle and It's Variations. Mr. Poyer credits C.S. Farris and John Beard for conducting extensive research on rod bayonet and altered 1903 Springfield Rifles.
The chart on pages 93 & 94 indicates the "S' stamp you describe may identify the stock as being made by RIA. On a Type 3A stock the "S" is 0.18" in height. A 3B stock would be the same as a 3A stock and have the stock cross bolt you show in the photo.
The second stock bolt shown in your picture, below the Hatcher hole and forward of the magazine well, could have been added by Springfield Armory.
The "Z" could be an initial of the person who tested the rifle with a proof cartridge.
Notice I used the word "could", because even the authors of the books on the 1903 Springfields were not certain.
However there's no 'Z' stamp on the stock. I think you meant 'N' stamp.
Here's a pic of an 'N' stamp, in almost the identical location, on another RIA 1903 that's not mine.
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