Vintage box of National's Guaranteed Hosiery 865 Brown Beige size 9-11 reinforced toe Nylons Made in USA

This is for a vintage box set of Nationa's Guaranteed Hosiery reinforced toe stockings. They have reinforced toe. Item number 865 fits sizes 9-11. Color Beige brown. Made in USA. Box says there are 12 pair but there are actually 16 pair in here. 1 is a different brand and the pack was opened. There is one other pack that looks opened but not used. The rest are still taped shut. I am not sure on the age of these. 80s maybe? The box does have some wear and it used to be taped shut.