11. Sale.—
The sale of a ship is usually evidenced by a bill of sale on a government form which will be furnished by the collectors. It is essential that it should include a copy of the last registry or enrollment and licenses, executed in the presence of two witnesses and acknowledged before a notary public. Mortgages may be made upon similar forms and the statute provides that, "No sale, conveyance, or mortgage which, at the time such sale, conveyance, or mortgage is made, includes a vessel of the United States, or any portion thereof, as the whole or any part of the property sold, conveyed, or mortgaged shall be valid, in respect to such vessel, against any person other than the grantor or mortgagor, his heir or devisee, and a person having actual notice thereof, until such bill of sale, conveyance, or mortgage is recorded in the office of the collector of customs of the port of documentation of such vessel." (Ship Mortgage Act, 1920, Subsection C (a). See Appendix, Merchant Marine Act, 1920, § 30.) While a prudent man will invariably evidence the sale of a ship by a written instrument, this is not essential to the validity of the sale, if the common law essentials to a sale of personal property—delivery or payment, in whole or in part, or both,—are present. The requirement of the statute (Rev. St. § 4170; Ship Mortgage Act 1920, Subsection H; See Merchant Marine Act 1920, § 30) that a bill of sale be given, containing a copy of the registry or enrollment, and recorded in the Collector's Office, is for the purpose of giving notice to the world of the transfer. Without these formalities, the sale is valid as against the grantor and persons having actual notice only; not as against any other persons claiming an interest in the ship. If an American vessel be sold to an alien without obtaining the Shipping Board's approval and without recording the transfer, the vessel is liable for forfeiture.