Okla. Stat. tit. 12A, § 12A-8-114

Oklahoma Statutes - Title 12A. Uniform Commercial Code Page 434

Evidentiary Rules Concerning Certificated Securities.

The following rules apply in an action on a certificated

security against the issuer:

(1) Unless specifically denied in the pleadings, each

signature on a security certificate or in a necessary

indorsement is admitted;

(2) If the effectiveness of a signature is put in issue,

the burden of establishing effectiveness is on the

party claiming under the signature, but the signature

is presumed to be genuine or authorized;

(3) If signatures on a security certificate are admitted

or established, production of the certificate entitles

a holder to recover on it unless the defendant

establishes a defense or a defect going to the

validity of the security; and

(4) If it is shown that a defense or defect exists, the

plaintiff has the burden of establishing that the

plaintiff or some person under whom the plaintiff

claims is a person against whom the defense or defect

cannot be asserted.