This free pattern originally published by The American Thread Company, Star Afghan Book, Book 17, in 1941.

45 X 72
Materials Required--
AMERICAN THREAD COMPANY
"DAWN" KNITTING WORSTED
18 2-oz. Skeins No. 1207.8 Dk. Blue.
9 1 3/4-oz. Skeins No. 1265 Rainbow Blend.
Bone Crochet Hook No. 4.
With Dk. Blue ch 245, 1 sc in each of the next 19 sts, * 3 sc in next st, 1 sc in each of the next 19 sts, skip 2 sts, 1 sc in each of the next 19 sts, repeat from * across row, ch 1, turn.
In succeeding rows skip the 2nd st at the beginning of each row and next to the last st at the end of each row and work in sc picking up the back loop of st only.
Work 6 more rows in Dk. Blue * 2 rows Rainbow Blend, 3 rows Dk. Blue, 4 rows Rainbow Blend, 7 rows Dk. Blue repeat from * until Afghan measures about 72 inches, completing a pattern.
EDGE. With Dk. Blue work 1 row sc on straight sides only.
Other great patterns from Star Afghan Book, Book 17:
Cape Cod Afghan
Carriage Cover Afghan
Charleston Garden Afghan
Harlequin Afghan
Highlander Afghan
Mexicana Afghan
Old Versailles Afghan
Pin Wheel Afghan
Sea Shell Afghan
Two Tone Afghan
Wigwam Afghan