Saw this today, no marks except the date on the rear ring in Thai.

Has an 18" barrel, straight stock with square forend. Is this what the navy Arms conversions looked like?

I don't remember the details but in the early '70s when I was in gunsmithing school the rifles were available .Some of the students used those rifles for custom work. They would take the 45-70 cartridge with little modification and were quite strong. This was the time when interest in the fine 45-70 cartridge started it's revival.
IIRC the original cartridge was 8mm rimmed. Navy Arms made some decent stuff .

I remember one being reviewed in one of the popular gun magazines back when Navy introduced them- I think Navy marked their products, I know Century does.

I would purchase one if I ran into it.

Would be stamped "Navy Arms, Ridgefield, N.J." apparently:

http://www.thehighroad.org/sho...7ffda74d800&t=495696

http://www.mausercentral.com/f...iewtopic.php?t=11993

The number is 14672. I believe that is the serial number.

If you didn't mention .45-70 I would say that was a home sporterized military rifle. You know, barrel cut shorter, stock cut shorter, top stock wood disgarded, and the military rear sight replaced. It was originally chambered for either 8x50R (Type 45 of 1902) or 8x52R (Type 66 of 1923). Are you sure that the bore is .45? That barrel looks to be the military contour.

I only had a dial caliper so I stuck it in the muzzle and got a reading of .446. There was some rust in the bore that may have contributed to giving a smaller reading than actual bore size and it was measured inside the lands but nowhere close to .323 (8mm).

The one I saw has the same Williams rear sight as the Navy Arms but has a bent bolt handle, not straight.

I would expect any rifle from Navy Arms to have the caliber stamped on the barrel. But it doesn't matter, you have what you have regardless of who did it. The Siamese 45-70 conversions usually have feeding problems.

No, that is not a Navy Arms rework. The ones from Navy Arms were quite well done and did have the caliber marked on them. I remember the barrel being long and tapered, not stepped down and the one in the picture. If I get a chance this weekend I will take pictures of my Dad's and post them.