Manufacture: Sirdar, Made in England by Harrap Brothers.
60% Wool 40% Courtelle
Black has heather overtones. Nice DK weight. Yardage unknown.

Courtelle was an early version of acrylic and some yarns of this era had high quality ratings with this fiber. I am hopeful this washes well. Found in box of old yarn after years of storage. I will need to take apart, wash, dry and ball.