Okla. Stat. tit. 70, § 70-2208: Bonds as legal investment

Any bank, trust, or insurance company organized under the laws

of Oklahoma may invest its capital, surplus, and reserves in bonds

issued under the provisions of this act. The officers having charge

of any sinking fund or any other fund of the state or any

department, agency, or institution thereof, including the various

funds established by Chapter 27 of Title 70 (House Bill No. 244 of

the Session Laws of 1945), or any county, city, town, township, or

school district in the state, may invest such funds in bonds issued

under the provisions of this act at the reasonable market value

thereof. Such bonds are also approved as collateral security for

the deposit of any public funds and for the investment of trust

funds.