21 Pa. Stat. § 277.1
In all cases where a president of a corporation who was in fact authorized to, and did, execute a written instrument by signing the name of the corporation by himself as president, but the acknowledgment certificate attached to such instrument fails to state that he was authorized to execute the instrument, and the language used in such certificate is not in the exact form prescribed by law for such acknowledgments and certificates, such acknowledgments are hereby validated. All such instruments in writing, so acknowledged and certified, may be offered in evidence without further proof. If such instrument, so acknowledged and certified, conveys, or relates to, or concerns any interest in, lands, it may be recorded in the recorder's office of the county or counties where such lands lie, and the record of same, made before or after the passage of this act, shall be constructive notice of all matters contained therein; and, such record, or exemplification of same duly certified, shall be legal evidence in all cases in which the original would be competent evidence.
21 P.S. § 277.1