Were the black plastic grills on 70 aar's painted? or were they left the original black plastic with no paint?

When was the first known black plastic grill produced?

Were the lower valance's also black plastic on the aar's?

I have an M46 born on 915 that has a black plastic grill. My other M46's , 910 and 4/70 have grey plastic grills and grey valance's.