Is the bbl address & caliber roll marked w/a die,,or hand engraved.
Newtons designation for 30-06 was '30 U.S.G.' on the few rifles I've seen.
If you go to this site/ Newton Rifles, Iroquois Arms Collectors and scroll down near the bottom there is a close up pic of the roll die marking of that address and caliber.
https://sites.google.com/a/iroquoisarmscollectors.org/iroquoisarmscollectors/home/newton-arms-coOne of the auction rifles above has a replaced 03Springfield bbl and the caliber is hand engraved on it (nice job too!) I don't think it has the Newton name and address on it though I may have missed it. I'd assume if there it would be hand cut also.
The only thing I can think of off hand about the rough turned appearance over the chamber area of the rifle in question is that a surplus '03 bbl was used to re-bbl it (yes they are threaded the same). The 03 bbl could have that area shaved down a bit to remove the military rear sight spline cut in the bbl, or perhaps the spline cut filled and then turned to true and finish it off.
The rough appearance may be more picture than reality but it does beg another look.,,and wether the markings on that bbl are roll die imprinted or hand engraved.
just some thoughts..