"Softer than the petals of a snapdragon, and even more beautiful ... Extremely simple to knit using #5 or # 9 needles ... 35 fashion right colors.
Picture courtesy of Ebay seller Gretl3042
As you might expect, you'll find some additional details over a Ravelry. According to a 1963 ad: "Reynolds Mohair No 1 is the lightest weight mohair, not as fuzzy as many, it has a slight amount of synthetic for buoyancy".
The product remained active in the market until 1973 (a good 11 year run), with all references after that being inventory liquidation type sales.
Should I come across more ads or relevant information, I'll come back and update this post.
Thanks for dropping by,