Rick, my understanding has always been that Chevrolet included the head restraints as standard equipment at the start of 1969 model year production, but prior to 1/1/69 buyers could delete them for a $16.90 credit. This window sticker shows them as a $16.90 option (additional charge) and then deleted for a $16.90 credit, so a net of zero to the buyer (no extra charge and no credit).
The only way this would make sense is if the head restraints were a $16.90 mandatory option prior to 1/1/69, but if so, it's news to me. I can recall seeing the credit on a couple early production window stickers in the past, but not the additional charge. That said, the window sticker pictured above looks totally legit to me
