In all cases where prior to January 1, 1934 instruments by law required or authorized to be registered show the signatures and seal of each of the grantors therein and further show that each of such grantors has appeared before or signed such instruments in the presence of a notary public, justice of the peace or other person duly authorized to take acknowledgments, and such instruments have been ordered registered by the clerk of the superior court or other officer qualified to pass upon probate and admit instruments to registration, and actually put on the books in the office of the register of deeds, as if properly acknowledged, all such instruments and their registrations are hereby validated and made as good and sufficient as though such instruments had been in all respects properly acknowledged: Provided, that this section shall not apply to any privy examination or acknowledgment of a married woman. (1953, c. 1334.)