Okla. Stat. tit. 12A, § 12A-3-115: Incomplete Instrument

INCOMPLETE INSTRUMENT

(a) "Incomplete instrument" means a signed writing, whether or

not issued by the signer, the contents of which show at the time of

signing that it is incomplete but that the signer intended it to be

completed by the addition of words or numbers.

(b) Subject to subsection (c) of this section, if an incomplete

instrument is an instrument under Section 3-104 of this title, it

may be enforced according to its terms if it is not completed, or

according to its terms as augmented by completion. If an incomplete

instrument is not an instrument under Section 3-104 of this title,

but, after completion, the requirements of Section 3-104 of this

title, are met, the instrument may be enforced according to its

terms as augmented by completion.

(c) If words or numbers are added to an incomplete instrument

without authority of the signer, there is an alteration of the

incomplete instrument under Section 3-407 of this title.

(d) The burden of establishing that words or numbers were added

to an incomplete instrument without authority of the signer is on

the person asserting the lack of authority.