374.07  ALTERATION, MUTILATION OF TAGS, CARDS, FRAME  NUMBERS.
   (a)   No person shall willfully or maliciously remove, destroy, mutilate or alter the number of any bicycle frame.  No person shall remove, destroy, mutilate or alter any license tag or registration card during the time in which the license tag or registration card is operative.  If any bicycle does not have a serial number stamped on the frame or if the number is illegible, the City Manager shall stamp an identification number on the bicycle frame.
(1980 Code 75.21)
   (b)   Whoever violates any provision of this section is guilty of a minor misdemeanor on a first offense; on a second offense within one year after the first offense, the person is guilty of a misdemeanor of the fourth degree; on each subsequent offense within one year after the first offense, the person is guilty of a misdemeanor of the third degree.