Md. Code, Natural Resources § 8–737

(a) A person may obtain a historical watercraft identification plaque from the Department for a boat that is:

(1) 25 years old or older; and

(2) Powered by the boat’s original type of power plant.

(b) The fee for a historical watercraft identification plaque is $25. The identification plaque shall be valid for the life of the boat.

(c) The Department shall issue a historical watercraft identification plaque, of the Department’s own design, to a person who applies to the Department on a form the Department supplies. When prominently displayed on the boat, a historical watercraft identification plaque shall entitle the boat owner to apply to participate in parades, shows, and special displays. The historical watercraft identification plaque may not qualify a boat for general recreational use.