Navy Marks?

[Pistol]

This is best I could get from the seller. No navy rear sight and it has a 4 inch barrel.

Now looking at it, I think it is a 1916 Navy frame with a mismatched commercial top, and a replacement barrel. The barrel has no numbers but does have whay appears to be a WWII mauser proof 855?

One wood bottom mag has X after the serial number. Also, a new serial number was etched in near the commercial C/N proof, apparently to match the toggle train. They etched in the last 2 digits of the toggle on the top of the extractor.

Any value in the frame, holster and mag?