Okla. Stat. tit. 84, § 84-852: Validity of a will

A. A will is valid as regards form, irrespective particularly

of the place where it is made, of the location of the assets and of

the nationality, domicile, or residence of the testator, if it is

made in the form of an international will complying with the

requirements of the Uniform International Wills Act.

B. The invalidity of the will as an international will does not

affect its formal validity as a will of another kind.

C. The Uniform International Wills Act does not apply to the

form of testamentary dispositions made by two or more persons in one

instrument.