Vintage Huntingdon men’s V-neck sweater, red w/black,cream,gray, acrylic,size S?

Classic 1960s vibes with the bright red, gray, cream and black v- neck sweater! Very lightweight, so it’s easy to wear as a layer. No fiber content given, but I’m guessing it is acrylic (and it has some stretch! ) No size given, but I’m guessing a women’s M or a men’s S (see measurements below) in very good pre loved condition! some wear on the cuffs due to age (see last photo) 18” pit to pit 18.5 pit to cuff arm length 21.5” length