IIRC the socks were made by Northland Woolens. Their web-site indicates they still make and sell a similar sock in 80/15/5 wool/angora/nylon blend.
My experience with RBW socks is that, while a good pure or near-pure wool sock like that (and for this purpose I consider angora to bs "rabbit wool") does not last long enough worn cycling to be worth buying, though I found them *extremely* comfy.
I do wish Northland Woolens made a 20% nylon sock. My final few pairs of those I got from RBW are giving out at the heel. I like the koala/kangaroo socks. But neither the knit nor the sizing is the same as those striped sporty shorties had. And those socks fit me perfectly.
Yours,
Thomas Lynn Skean