Okla. Stat. tit. 16 § 39a
All deeds, mortgages, conveyances, or other instruments affecting the title to real property in the state, the acknowledgment of which was taken and certificate of acknowledgment executed by a Justice of the Peace of the county wherein such real property is situated, and/or where any notarial acknowledgment was taken before a notary public of any county in this state or of any other state where the certificate of acknowledgment is defective in form, and where any such instrument has actually been filed and recorded or copied into the permanent volumes of public title records in the office of the county clerk of the county in which said property is situated for a period of five or more years and has not been canceled of record, the recording of any such instrument is and shall be and become a valid public record in all respects and for all purposes as fully as if the same had been originally acknowledged before and certificate executed by an authorized officer and in the manner and form required by law at the time of the execution thereof.
Okla. Stat. tit. 16, § 39a