400.8-206.  Completion or alteration of security certificate. — (a)  If a security certificate contains the signatures necessary to its issue or transfer but is incomplete in any other respect:

  (1)  Any person may complete it by filling in the blanks as authorized; and

  (2)  Even if the blanks are incorrectly filled in, the security certificate as completed is enforceable by a purchaser who took it for value and without notice of the incorrectness.

  (b)  A complete security certificate that has been improperly altered, even if fraudulently, remains enforceable, but only according to its original terms.