Licensed Chauffeur 1951 Chicago

Licensed Chauffeur 1951 Chicago, # 89379. the back is marked with some symbols, GREEN DUCK CO, CHICAGO.

By the early 1950s, paper licenses had replaced badges, which were more expensive to produce. The rarest, most collectible chauffeur badges come from smaller states with fewer taxi operators, rather than those with metropolitan hubs like New York or California. (Cited from CW)

1951 - 2,406,200 passenger vehicles are registered with the Illinois Secretary of State’s office. Plates have maroon characters on a natural aluminum background. This is the only year that the state issues plates with an unpainted background.
This is the last year that chauffeur badges are required of paid drivers and mechanics. The badges had been required since 1907. Green Duck Company of Chicago produces 250,000 badges at a cost of 81 cents a badge this last year. (NOTE FROM https://www.cyberdriveillinois.com/special/plate_history/1950_1959.pdf:)