This original 1941 knitting pattern booklet, published by The Spool Cotton Company under the Chadwick's Red Heart Wools brand, carries Book No. 172 and originally sold for 10 cents. It targets home knitters mobilized by the National Defense Program, urging women across the country to knit sweaters and wool accessories for men in Army, Navy, and Air Force training.

The Spool Cotton Company, parent of the Red Heart brand, produced these defense-themed booklets in multiple editions. This copy is the Fifth Edition, printed in the U.S.A. under copyright H-9002 C-21. Patterns include a V-Neck Pullover (No. S-100) and a Round or Turtle Neck Pullover (No. S-101). The cover retains strong red and blue color, with minor corner wear and light surface marks. Interior pages read cleanly with minor pencil notations. A sharp piece of American home-front ephemera.