Okla. Stat. tit. 36, § 36-1511: Valuation of bonds

A. All bonds or other evidences of debt having a fixed term and

rate of interest held by any insurer may, if amply secured and not

in default as to principal or interest, be valued as follows:

1. If purchased at par, at the par value.

2. If purchased above or below par, on the basis of the

purchase price adjusted so as to bring the value to par at maturity

and so as to yield in the meantime the effective rate of interest at

which the purchase was made, or in lieu of such method, according to

such accepted method of valuation as is approved by the Insurance

Commissioner.

3. Purchase price shall in no case be taken at a higher figure

than the actual market value at the time of purchase, plus actual

brokerage, transfer, postage or express charges paid in the

acquisition of such securities.

4. Unless otherwise provided by valuation established or

approved by the National Association of Insurance Commissioners, no

such security shall be carried at above the call price for the

entire issue during any period within which the security may be so

called.

B. The Insurance Commissioner shall have full discretion in

determining the method of calculating values according to the rules

set forth in this section and not inconsistent with any such methods

then currently formulated or approved by the National Association of

Insurance Commissioners.