This is a Genuine GM upper hood latch, found in a old closed dealerships parts room, no box, it fits all 1957 Pontiacs. Stamped # 523193.
Bonneville
Chieftain
Chieftain Catalina
Star chief
Star chief Customs

Please Note:  NOS and USED parts are made by the OEM.  These parts can range from 10 to 75 years old and were made to the standards of the year the part was manufactured. Most NOS parts are in good to excellent condition unless otherwise stated, but please do not expect them to be perfect