The only 5 inch barreled units I've seen, are stamped 38/200 as well as 38 S&W on the barrel. The one I have now is so marked. The 38/200 has been stamped on after, not sure why.
The top strap is marked United States Property. The finish is crude to say the least. Lots of tool marks etc and it looks to be parkerized rather than blued. Other than the barrel, there are not stamps on the left side of the pistol. The only other marks are the S&W trademark, Made in USA and a very small crown over crossed flags under that. The cylinder has a tiny BNP mark between each flute, in line with the locking recesses.
The butt has the serial numbers stamped into it and the grips are dead plain walnut, that are oiled and unpolished. No checkering or bezels and they don't fit particularly well. It also has one of the oblong lanyard rings.
The bore is pristine, and it shoots heavy, lead bullets very well. Doesn't particularly shoot the 158 grain commercial offerings very well.
I did see a batch of them that came into Canada to Lever Arms in 1968, that were similarly marked but the finish was as good as any commercial S&W out there.
Anyone that thinks the 38/200 cartridge is anemic, hasn't seen one used on small game. I will admit, the 38 S&W 158 grain round leaves a lot to be desired though. When the pistols are loaded with their original weight bullets, that 200 grain, soft lead slug at 700fps had a lot of decent qualities in a firefight at normal pistol ranges. That long, heavy for caliber pistol bullet had a lot of penetration and impact force. They only went to copper jacketed and lighter weight 175 grain bullets because the UK signed the Geneva Convention, where lead bullets were banned for military use.
Just to get back on topic, I bought the pistol at a gun show for $200, three years ago. It retains about 90% of its original finish and there is no holster wear, so I don't think it was ever issued. There are no sold out of service stamps on the pistol either. I don't know if that is unusual or not.
The vendor I purchased the pistol from was getting a bit desperate. He had priced his stuff for Edmonton/Dawson Creek and Fort Mac. I think the pistol was the only thing he sold at the show and needed gas money to get home.
NAA our pistols are almost identical. Mine doesn't have the flaming bomb or GHD stamp on the top strap. Where you have the little proof stamp on the right side of the barrel, mine has been hand stamped 38/200.
Thx for posting the pics. Mine is in similar condition, in the 841### range and I just noticed a WB with a flaming bomb and a tiny capital R on the butt as well.