This 1957 advertisement was a promotion of Dawn Nylon Yarn, as well as their newly released Star Sweater Book No 127 - 4 to 14 Fashions.
Photos from ebay shop casavantclassics
Dawn Nylon Yarn was introduced to the market in 1951. It's a 3 ply permanent 'Crimp-set". Anti Shrink, Moth-proof. You'll find a few more details over at Ravelry. I do not have the pattern book 127 in my collection, but do have a number of patterns that use Dawn Nylon in the shop from magazines and 'other' pattern books.
The first reference to a sales price is October 1951 at 39 cents. I found a variety of newspapers ads that were all sales promotions from individual stores.
Dawn Nylon remained active in the market until 1969, this being one of the last advertisements I found. Really, an 18 year life on the yarn was a pretty good run.
I'm sure I'll come across more magazine ads for Dawn Nylon; there's still quite a number of magazines awaiting review and processing. Should I come across anything, I'll add it to this post.
Thanks for dropping by,
Update - 3/17/2019. Here's another fun ad from McCalls Needlecraft Magazine - 1959.