Okla. Stat. tit. 16, § 16-37b: Foreign execution and acknowledgments validated -

Exceptions.

All deeds, mortgages, releases, oil and gas leases, powers of

attorney and other instruments of writing for the conveyance or

encumbrance of any lands, tenements or hereditaments situated within

this state, now of record or hereafter recorded which are executed

and acknowledged or proved in any state, territory, District of

Columbia or foreign country, in conformity with the law of such

state, territory, District of Columbia or foreign country, or in

conformity with the Federal Statutes, shall be as valid as to

execution and acknowledgment thereof, only, as if executed and

acknowledged within this state in conformity with the provisions of

the laws of this state. Provided this act shall not validate any

deed, mortgage, releases, oil and gas leases, powers of attorney,

and other instruments of writing for the conveyance of any lands,

tenements, or hereditaments, the validity of which is in litigation

upon the effective date of this act. Provided this act shall not

validate any execution or acknowledgment fraudulently obtained.