Images.
Fortunately the OP has a copy of the research letter from Bob Beach, which documents exactly what the gun is. The white vinegar experiment did not show evidence of a crolle pattern.
I believe the marks are certainly legit, and the gun has been the victim of a very bad blue job; I'm afraid with hot caustic salts.
Opinions are most welcome. The OP intends to have Dan Morgan take a look and possibly re-blue

[Linked Image from photos.smugmug.com]

[Linked Image from photos.smugmug.com]

[Linked Image from photos.smugmug.com]