21 Pa. Stat. § 224
In all cases of the sale, conveyance, mortgage or other instrument of writing, heretofore made or which may be hereafter made by any person, or husband and wife, concerning any lands, tenements or hereditaments, or any estate or interest therein, lying or being within this commonwealth, and heretofore acknowledged or proved, or hereafter acknowledged or proved, before any commissioner in chancery in any foreign country, according to the forms now or hereafter required by the laws of this state relative to such acknowledgment or probate, duly certified under the seal of office of such commissioner in chancery, shall be valid to all intents and purposes, and be in like manner entitled to be recorded, as if the same had been duly acknowledged or proven according to the existing laws of this commonwealth: Provided, That no case heretofore decided judicially shall be affected by this act.
21 P.S. § 224