The significance of using a signature pen is to prevent forgery. In fact, as long as the contents of the contract or the agreement prohibit the use, as long as the signature expresses the true meaning, it has legal effect.

Valid, unless he raises an objection himself later, keep it. If you really want to raise an objection, you can mention what is engraved, as long as the meaning is true. Of course, in order to avoid trouble, it is recommended to standardize the use of unified stationery.