For decades, cereal companies have included premiums [promotional gifts] inside their packages, printed on the cartons or to send for with a special coupon and redemption instructions.
During the 1940s, Pep cereal [a long-discontinued Kellogg’s brand] offered a series of water-applied decals within its boxes. Most likely made by the Meyercord Company (one of America’s largest transfer decal manufacturers at the time), one decal in particular had an alphabet in gold letters with black outlines.
(One can only presume the marketing strategy was to have kids bug their parents to buy more Pep cereal if the child needed more than one letter of the alphabet for his or her initials!)
Those decal letters have inspired a digital version as the outline character font Toy Decals JNL, which is available in regular oblique, solid and solid oblique styles.