Conn. Gen. Stat. § 42a-3-204
Endorsement.
(b) “Endorser” means a person who makes an endorsement.
(c) For the purpose of determining whether the transferee of an instrument is a holder, an endorsement that transfers a security interest in the instrument is effective as an unqualified endorsement of the instrument.
(d) If an instrument is payable to a holder under a name that is not the name of the holder, endorsement may be made by the holder in the name stated in the instrument or in the holder's name or both, but signature in both names may be required by a person paying or taking the instrument for value or collection.
See Sec. 42a-3-205 for successor provisions to Sec. 42a-3-204, revised to 1991, re special and blank endorsements.
A stamped signature on a note that meets signature requirements under Sec. 42a-3-401(b) constitutes an endorsement under section, as it is a signature made for the purpose of negotiating the instrument. 197 CA 129.