462A.6A  Exemption from display of registration and capacity numbers.
  The following vessels are exempt from displaying a registration number and a passenger capacity number as required in section 462A.5:
  1.  Authentically constructed native American styled craft including birchbark canoes, dugout canoes, competitive racing shells, reed boats, and skin-covered canoes or boats.
  2.  Historically styled craft such as keel boats used only during historic recreations or public demonstrations.
  3.  A vessel which has a valid marine document issued by the United States coast guard and the vessel bears the identification required in the document.
  4.  A sailboard. However, the registration decal shall be attached to the bottom surface of the bow.
88 Acts, ch 1183, §2
C89, §106.6A
92 Acts, ch 1131, §2
C93, §462A.6A