Cal. Veh. Code § 9853.5
Upon request, the department shall issue for any power-driven pleasure craft which is constructed of wood and which was constructed prior to December 31, 1942, a special plaque which identifies the craft as a vessel of historical interest. The provisions of this section shall apply to documented as well as undocumented vessels. The size, shape, and content of such plaque and its positioning on the vessel shall be determined by the department after consultation with the Department of Boating and Waterways; provided, that such plaque shall be of a durable material and shall be no smaller than six inches in height and six inches in width. A reasonable fee, as determined by the department, sufficient to support the administration of such program, shall be charged for issuance of the plaque. The plaque shall be valid for the life of the vessel.
Ca. Veh. Code § 9853.5