Most g-block byf44s will have checkered butt plates, but as Brian mentioned, that’s the approximate letter block that they began to phase in that feature, so it’s possible that smooth butt plates were still being used. What’s the approx serial number within the g-block of the rifle that you’re looking at?
On page 226 of Volume IIa of Bruce and Mike’s books, the checkered butt plate shown as a reference is from a g-block byf44.
If you have the rifle in hand, you could carefully remove the butt plate and check to see if there’s a checkered imprint left on the wood. If you don’t see that, odds are your stock was outfitted with a smooth butt plate.
With all of this in mind, just be careful and do your due diligence. Analyze the way the stock is WaA’d and serial numbered (internally). If everything lines up, you’re probably okay.