(1) When a bill contains words prohibiting transfer, or indicating an intention that it should not be transferable, it is valid as between the parties thereto, but is not negotiable.
(2) A negotiable bill may be payable either to order or to bearer.
(3) A bill is payable to bearer which is expressed to be so payable, or on which the only or last indorsement is an indorsement in blank.
(4) A bill is payable to order which is expressed to be so payable, or which is expressed to be payable to a particular person, and does not contain words prohibiting transfer or indicating an intention that it should not be transferable.
(5) Where a bill, either originally or by indorsement, is expressed to be payable to the order of a specified person, and not to him or his order, it is nevertheless payable to him or his order at his option.