Johnny Unitas spent the majority of his career playing for the Baltimore Colts. He was a record-setting quarterback, and the National Football League's most valuable player in 1959, 1964 and 1967. For 52 years he held the record for most consecutive games with a touchdown pass (which he set between 1956–1960), until New Orleans Saints quarterback Drew Brees broke his long standing record on October 7, 2012. Unitas was the prototype of the modern era marquee quarterback with a strong passing game, media fanfare, and widespread popularity. He has been consistently listed as one of the greatest NFL players of all time.

In each of his first three seasons, Donovan played for a team which went out of business. He started out with the first Baltimore Colts, who folded after his rookie season in 1950, followed by the New York Yanks in 1951, and their successor, the Dallas Texans, in 1952. After the Texans franchise was moved to Baltimore in 1953 and became the second Baltimore Colts, Donovan played with that team. He became one of the stars in an outstanding defense and was selected to five straight Pro Bowls, from 1953 through 1957. The Colts won back-to-back championships in 1958 and 1959. He was selected to the Pro Football Hall of Fame in 1968.

This Baltimore Ravens cap was signed under the bill by Baltimore Colts legends Johnny Unitas and Art Donovan. This cap includes a JSA sticker and COA.