Three vintage skeins of black and white "Begonia" wool and rayon knitting yarn, c.1930s-50s

Three vintage 1oz skeins of black and silvery-white "Begonia" 3 ply knitting yarn (53% pure wool, 47% Courtaulds rayon) with their original labels, each approximately 28cm long, and probably dating from between the mid-1930s and the early 1950s.  The labels are creased and discoloured (and one is also torn); the yarn itself appears to be in good condition, although we regret that we cannot guarantee that it is still usable.