Okla. Stat. tit. 58, § 121

Letters of administration must be signed by the judge, under the seal of the court, and substantially in the following form: State of Oklahoma, County of ______ C D is hereby appointed administrator of the estate of A B, deceased. Witness G H, judge of the county court of the county of ______, with the seal thereof affixed, the ______ day of ______ A. D., 19__. (Seal and the official signature of the judge.)