21 Pa. Stat. § 41
All deeds and conveyances made and granted out of this province, and brought hither and recorded in the county where the lands lie (the execution whereof being first proved by the oath or solemn affirmation of one or more of the witnesses thereunto, before one of more of the justices of the peace of this province, or before any mayor or chief magistrate or officer, of the cities, towns or places, where such deeds or conveyances are or shall be made or executed, and accordingly certified under the common or public seal of the cities, towns or places, where such deeds or conveyances are so proved respectively), shall be as valid as if the same had been made, acknowledged or proved, in the proper county where the lands lie in this province.
21 P.S. § 41