This is a New Old Stock locking gas cap for numerous B&C body Chrysler product cars built between 1967 and 1970. This piece comes in the original box. The Chrysler part number for this cap is 2534323.
This cap will work on the following:
Chrysler: Newport, 300, and New Yorker 1967 to 1970. Will not work on wagon!
Dodge: Coronet, 440,500,R/T Super Bee 1968 to 1970, except Wagon ;Polara, Monaco 1967 to 1970, not for Wagon
Imperial: 1967 to 1970
Plymouth: Satelitte, Road Runner, GTX, Belvedere 1968 to 1970, Fury 1967 to 1970