The chairman chaired meetings of the council, and was the county's civic leader, filling a similar role to the mayor of a borough or city.
In 1894 the Royal Commission on the Amalgamation of the City and County of London strongly recommended that a clerk be appointed, independent of the parties on the council, as was the practice in municipal boroughs.
By 1926 the number of formal occasions attended by the chairman had increased, and it was felt that he was at a distinct disadvantage due to not having a distinguishing mark to indicate his office.
The badge was made by an instructor at the Central School of Arts and Crafts and featured the council's coat of arms within an oval of London Pride.
The badge was worn on a ribbon in a distinctive barry wavy argent and azure pattern derived from the arms.