No person shall willfully or maliciously remove, destroy, mutilate or alter the number on any bicycle frame, or remove, destroy, mutilate or alter any license tag or registration card during the time such tag or card is operative. If any bicycle does not have a serial number stamped on the frame or if such number is illegible, the Police Department shall stamp an identification number on such bicycle frame. (Ord. 145-55. Passed 5-21-56.)