(a) General rule.--Where the contract contemplates overseas shipment and contains a term C.I.F., C. & F. or F.O.B. vessel, the seller unless otherwise agreed must obtain a negotiable bill of lading stating that the goods have been loaded on board or, in the case of a term C.I.F. or C. & F., received for shipment.

(b) Bill in set of parts.--Where in a case within subsection (a) a tangible bill of lading has been issued in a set of parts, unless otherwise agreed if the documents are not to be sent from abroad the buyer may demand tender of the full set; otherwise only one part of the bill of lading need be tendered. Even if the agreement expressly requires a full set:

(c) Definition of “overseas”.--A shipment by water or by air or a contract contemplating such shipment is “overseas” insofar as by usage of trade or agreement it is subject to the commercial, financing or shipping practices characteristic of international deep water commerce.