Taylor had a 450 3 1/4 Wilkes serial number 4988 that he sold to Steve Miller, a US citizen, in 1965. In 1970 that rifle was owned by Dr C Robert White. of Missoula Montana. I think I remember it coming up for sale a few years ago. No claim to it being the last rifle made for him.

The picture I have of that rifle is the same one Marrakai posted that labeled it a 470.