[Fr. Frank]

The form says the owner can sign off on it.
Note that some tax collector agents will say it has to have the actual original power plant. It does not. It has to be "powered by its original type power plant." Not to mention that outboard hulls are not manufactured with power plants.

The USCG recognizes the following "types" of power plants: inboard, outboard, sterndrive, jet drive, and "other". If your antique vessel has not been converted from sterndrive to outboard, you have the original "type" power plant. My '72 is powered by an '06 Mercury, and I had to go get the actual text of the statute and show it to the supervisor before I could register the boat as an antique.

Here is the text of the law, Florida Statutes 327.72(2)(a)
A vessel that is at least 30 years old, used only for recreational purposes, and powered by the vessel's original-type power plant may be registered as an antique vessel. When applying for registration as an antique vessel, the owner of such a vessel shall submit certification, as prescribed by the Department of Highway Safety and Motor Vehicles or from a marine surveyor that the vessel meets the requirements of this paragraph.