13 GCA § 8311: Effect of Unauthorized Endorsement.

Unless owner has ratified an unauthorized indorsement or is otherwise precluded from asserting its ineffectiveness

(a) He may assert its ineffectiveness against the issuer or any purchaser other than a purchaser for value and without notice of adverse claims who has in good faith received a new, reissued or reregistered security on registration of transfer; and

(b) An issuer who registers the transfer of a security upon the unauthorized indorsement is subject to liability for improper registration (Section 8404).