A deed executed under the power vested in a representative to whom letters of office were issued by any court of competent jurisdiction in any other state of the United States or the District of Columbia under a foreign will admitted to probate in that jurisdiction is evidence of title in the grantee to the same extent as was vested in the testator at the time of his death, if the will is admitted to probate in the court of the proper county in this State before delivery of the deed, unless letters of office on the estate of the decedent have been issued in this State and remain unrevoked.
755 ILCS 5/22-6