21 Pa. Stat. § 271
All acknowledgments or probates of deeds or other instruments of writing, heretofore taken or made, or which shall hereafter be taken or made, shall be construed to have the same effect to all intents and purposes, although the same may have been certified by the officers before whom such acknowledgments or probates have been made under their hands only, as if the same had been certified under their hands and seals, and the omission in any certificates heretofore made, or hereafter to be made, by any officer authorized to take such acknowledgments and probates, to certify the same to have been taken before him under his seal (the same being duly certified under his hand), shall not be held or adjudged to avoid, prejudice, or render invalid the acknowledgment or probate of any deed or other instrument of writing as aforesaid, nor shall the recording heretofore done, or hereafter to be done, of any deed or other instrument of writing as aforesaid, be deemed invalid or defective by reason of the omission of any such officer as aforesaid to certify any acknowledgment or probate as aforesaid under his seal, the same being certified under his hand in due form.
21 P.S. § 271