help identify old hiking socks

strange post maybe, but y’all are the defacto sock community fyi.

please help identify these vintage, med-thick hiking socks from my war hero grandfather. the fit is fantastic. they wear and age so well that i’m going to attempt darning this hole i found in 1/5 pairs i have. im curious of the brand and material. goog img search was no help.

look familiar? is darning a waste of time on non-exotics? are they wool blend?

thanks for your twine and attn to this matter. ive attached a few too many pics to help on our journey