Dino, because of this?
There's no evidence that the crossbolt stamps are original manufacture inspection stamps. It seems more likely that they are indicative of a post-manufacture, scheduled inspection regime. -Boris Badinov
I'll be very generous here and say that might have been speculation offered by Boris but he did not support it with any kind of logic, and it goes directly against a couple decades of my own visual experience. It's a baffling comment.
These rather small, lightly stamped cartouches are mostly obliterated during sanding and shellacking at refurb, and afterwards are very faint - if they can be seen at all.
Yet they exist on literally all of the pristine 'as-issued' and 'never-issued' examples I've seen, unless some owner has refinished the stock himself.