A marine policy must specify--
         (1) the name of the assured, or of some person who effects the insurance on his behalf;
         (2) the subject-matter insured and the risk insured against;
         (3) the voyage, or period of time, or both, as the case may be, covered by the insurance;
         (4) the sum or sums insured;
         (5) the name or names of the insurer or insurers.