1. If an endorsement is made by the holder of an instrument, whether payable to an identified person or payable to bearer, and the endorsement identifies a person to whom it makes the instrument payable, it is a "special endorsement". When specially endorsed, an instrument becomes payable to the identified person and may be negotiated only by the endorsement of that person. The principles stated in section 41-03-10 apply to special endorsements.
2. If an endorsement is made by the holder of an instrument and it is not a special endorsement, it is a "blank endorsement". When endorsed in blank, an instrument becomes payable to bearer and may be negotiated by transfer of possession alone until specially endorsed.
3. The holder may convert a blank endorsement that consists only of a signature into a special endorsement by writing, above the signature of the endorser, words identifying the person to whom the instrument is made payable.
4. "Anomalous endorsement" means an endorsement made by a person that is not the holder of the instrument. An anomalous endorsement does not affect the manner in which the instrument may be negotiated.