Okla. Stat. tit. 84, § 84-71: Law of place governs execution or revocation

A will, or a revocation thereof, made out of this state by a

person not having his domicile in this state; is as valid when

executed according to the law of the place in which the same was

made, or in which the testator was at the time domiciled, as if it

were made in this state, and according to the provisions of this

article.