Hey John,
Please take a very close look at the front of the frame on this gun as shown in my negative image (which often makes flaws stand out better than natural color).
The last two digits have obviously been double-struck somewhat deeper, but the first two have not.
There certainly exists the possibility that this frame has been force-matched by someone...
In Circle "A", is there any evidence under a jewelers loupe that there was a suffix at one time?
...and is the flat or dent in circle "B" in the white or has it been blued over?
We need Tom Armstrong to examine the KM proofs on the left side of the frame, but they look okay to me...
The blank chamber is correct.
I might be paranoid, but I think that in the case of Navy's... it is almost warranted unless you know the personal ownership history of gun.
thanks for sharing.