Confused about a Parker gun listed on GB.

[edgarspencer]

Originally Posted by Dean Romig

IMO it's a Grade 4 or CH gun with a CH grade stock with the correct drop points that has been re-checkered to the BH style. The gun pretty well speaks for itself. Unfortunately the original owner's wayward son destroyed the original barrels by cutting them, one to a length that would be impractical for any purpose other than cowboy action shooting and the Damascus barrels were cut to render them highly illegal.
The engraving is certainly that of the Grade 4 of that 1899 period..

I don't disagree, but it begs the question; Why is it listed in the serialization book as a grade 4, but the letter says grade 5?