Chicago Police 1st issue, known as the "flat badge" with the Childs company first hallmark.  Circa 1870.

Chicago Police 1st issue Sergeant badge. These badges were smaller than the police officer badges.

Chicago Police 2nd issue, known as the "coat shield."   This style was so unpopular with the rank and file officers that the city agreed to go back to a star design after only a month of use.  It is noted that the transition to the new star may have taken up to a year. Circa 1889.

Chicago Police 3rd issue, known as the "pie plate" Slightly larger than the 1st issue and with a four digit number.  Circa 1889

1905-1955 4th issue Chicago Police badge

Rare solid platinum badge I've seen. Courtesy of Ed McClain.

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