(a) In cases of acknowledgment or proof of deeds or conveyances of real estate taken within the United States or territories thereof, when taken before any court or officer having a seal of office, the deed or conveyance shall be attested under the seal of office. If the officer has no seal of office, then it shall be attested under the official signature of the officer.
(b) In all cases of deeds and conveyances proven or acknowledged outside the United States or its territories, the acknowledgment or proof must be attested under the official seal of the court or officer before whom the probate is had.