Chrysler's key system of doors/ignition (pentastar - Y-152) key and round head key (glove box / trunk / wagon door) lasted from 1963 through 1989, at least Prior to the pentastar the ignition/door key was multisided. CY9 was another number for the round head trunk key. The trunk key in the late 1950's into the 1970's was one side flat - no key grooves. The 1940's keys dated back to about 1941. Have one Y149 key with "REPLACEMENT FOR CHRYSLER" on the round head.