This crochet edging leaflet, No 109L from The Spool Cotton Company, takes us all the way back to 1939.
As was frequently the custom for this time period, the leaflet was issued in promotion of their newly released pattern book 109 - A Bookful of New Edgings. The concept, of course, was give you a couple of the patterns and perhaps you'd decide to buy the entire book. The book was issued as a promotion to their Clarks or Coats (before it was officially Coats and Clarks) Mercerized Crochet Cotton.
I've recently started an album over at Google Photo for Crochet Edging Patterns. I've added the six to that album, in case you are interested in browsing through, or giving them a crochet.
Okay, chatting done; I'll get back to work now.
Thanks for dropping by,