Thanks for the reply. I was certain the one I saw was rubber, so I assumed it was incorrectly identified. Then I did some digging. I found this information from a reproduction parts supplier for the 67 Grand Prix.
The 2nd Design emblem is a metal casting with a brushed chrome face and hand-painted details for an original appearance. Adding to the authenticity, each emblem is hand-painted with a black Pontiac star and border. Two mounting studs are included for a straightforward installation.
If your vehicle requires the 3rd Design, our injection-molded rubber emblem features a steel core for strength and rigidity. This black rubber emblem is detailed in silver paint and features a Pontiac star and border as well as two threaded mounting studs for installation.