Letters testamentary must be substantially in the following form:
State of Oklahoma,
County of ______.
The last will of A B, deceased, having been proved and recorded in the county court of the county of ______, C D, who is named therein, is hereby appointed executor.
Witness G H, judge of the county court of the county of ______, with the seal of the court affixed the ______day of ______A. D., 19__.
Okla. Stat. tit. 58, § 110