The angle of the pitch affects the point of impact of the charge.
I suspect the “Pitch Point Blank” means that the gun is intended to deliver the centre of the pattern to the point of aim.
What we would probably call 50/50 these days.
Now that makes sense. The gun was ordered with a 2" DAH. Unusual for a sxs I'd think back in those days.
Actually, pitch has a minimal effect upon point of impact, as compared to other stock dimensions such as drop at heel and comb, and stock cast. Pitch is more important in gun fitting to maximize the area of contact of the buttplate with the shoulder pocket. This has the effect of helping to minimize felt recoil. This also aids in helping shooters of different physical stature have a consistent and more comfortable gun mount while shooting. Severely incorrect pitch, negative or positive, does have the effect of creating more muzzle flip, either up or down. So because of that it can influence point of impact. But again, not nearly as much as drop at comb and heel, or stock cast. That's because those other dimensions have much more influence on correctly and naturally aligning the shooters' eye with the rib or bore axis. With shotguns, it must be remembered that the shooter's eye is in effect the rear sight.
None of that, nor arguments about "point blank range" for sight settings in rifles or artillery has anything to do with the mystery of what "Pitch Point Blank" meant on the order card for this particular Fox shotgun. Perhaps it would help us to make an educated guess if the Fox shotgun associated with that order card is also available, and if we knew for certain that it was built according to those specs, and if we also knew the gun was still in that original stock configuration. Then measurements of the actual pitch could be taken to try to make some sense out of it. But barring an explanation from the guy who wrote those instructions on the order card, we would all still be just guessing.
I have never seen or heard the term "Pitch Point Blank" to describe stock pitch, so I am abstaining from playing guessing games.
