You don't have any pictures of the "metal" part of the rifle.
In other words, we can't see whether the rest of the rifle was of a higher grade.
If the metal is pretty much "standard", there are a couple of possibilities. The grip cap and butt plate do appear to be "standard".
1. The original wood needed to be replaced at some point and somebody came up with some nicer looking wood.
2. Someone at the factory just happened to grab some nicer looking wood when it was originally being assembled.
3. Or, it could actually be a higher-grade gun.
On a side note, years ago I purchased a (new)1971 Remington 700 ADL in 7mm Rem Mag which has a beautifully-figured stock.
In fact, the buttstock is very similar to this one:
https://www.remington.com/custom-shop/c ... om-c-grade
So, there could be several circumstances where some nice-looking wood could get put on a rifle.