Okla. Stat. tit. 12A, § 12A-3-403: Unauthorized Signature

UNAUTHORIZED SIGNATURE

(a) Unless otherwise provided in this article or Article 4 of

this title, an unauthorized signature is ineffective except as the

signature of the unauthorized signer in favor of a person who in

good faith pays the instrument or takes it for value. An

unauthorized signature may be ratified for all purposes of this

article.

(b) If the signature of more than one person is required to

constitute the authorized signature of an organization, the

signature of the organization is unauthorized if one of the required

signatures is lacking.

(c) The civil or criminal liability of a person who makes an

unauthorized signature is not affected by any provision of this

article which makes the unauthorized signature effective for the

purposes of this article.