They were unsold shop stock, and have been in storage at the shop ever since.
Sock size 11" (foot length), which is roughly the equivalent of a UK men's size 8 1/2 to 9.
New, and in perfect condition - except that the card label is creased, as you can see.
These socks are unused shop stock from around the mid 1970s, and are in lovely condition.
However, in view of their age, they should be washed before use.