The City Street Department, with reference to traffic-control signs, signals, or markers owned by the city, is authorized to indicate the ownership of the signs, signals, or markers on the back of the devices in letters not less than 3/8 inch, or more than 3/4-inch in height, by use of a metal stamp, etching, or other permanent means. Except for employees of the City Street Department, police officers, contractors and their employees engaged in a highway construction contract or work on the highway approved by the city, it is unlawful for any person to possess a sign, signal, or marker so identified.
(ILCS Ch. 625, Act 5, § 11-313) Penalty, see § 70.99