It shall be unlawful for any person, wilfully or maliciously to remove, destroy, mutilate or alter the manufacturer's serial number of any bicycle licensed hereunder; or to remove, destroy, mutilate or alter any license tag or emblem issued hereunder during the time in which the license tag or emblem is in force. The chief of police is hereby authorized to stamp numbers on the frame of the bicycle, as provided in subsection 22-117(e) of this chapter. (1963 Code ch. 20A, § 20.715)