Okla. Stat. tit. 36, § 36-1608: State, district or Canadian obligations

An insurer may invest in bonds, notes, warrants and other

securities not in default which are the direct obligations of any

state of the United States or of the District of Columbia, or of the

government of Canada or any province thereof, or for which the full

faith and credit of such state, district, government or province has

been pledged for the payment of principal and interest. Bonds,

notes, warrants and other securities classified as revenue,

prerefunded or declining balances are not considered acceptable

investments for this purpose.