grand bill of sale

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

GRAND BILL OF SALE, Eng. law. The name of an instrument used for the 
transfer of a ship, while she is at sea; it differs from a common bill of 
sale. (q. v.) See 7 Mart. Lo. R. 318; 1 Harr. Cond. Lo. R. 567.