What, no pictures of estate items?

In my OPINION:
Misidentified is easy, people dispersing estates are not experts.
Mismarked is a known phenomenon, they are not lingering over these things and an employee picking up the wrong stamp happens.

Mismeasured by two inches seems unlikely, a 5" K22 is a fantasy. Are there any at all?

Rebarrelled is possible, my Combat Masterpiece was rebarrelled but back to the same length. Tell by looking, barrels were numbered to the gun then.

Special order, I dunno. What will that get you, a 4" with post sight?