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__.
R.L.1910, § 6242; Laws 1953, p. 234, § 10.