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Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter V : Transfer to a neutral flag - Art. 56.
Art. 56. The transfer of an enemy vessel to a neutral flag, effected after the outbreak of hostilities, is void unless it is proved that such transfer was not made in order to evade the consequences to which an enemy vessel, as such, is exposed.
There, however, is an absolute presumption that a transfer is void --
(1) If the transfer has been made during a voyage or in a blockaded port.
(2) If a right to repurchase or recover the vessel is reserved to the vendor.
(3) If the requirements of the municipal law governing the right to fly the flag under which the vessel is sailing, have not been fulfilled,