The emblems were made by die casting a bezel/holder, which was then chrome plated (same bezel was used from 1968 through the mid 70s for various applications, Cudas, Darts, Dusters, Road Runners, etc.). A sandwhich/laminate was made as an insert to make them correct for the various applicatins. The laminate material (the process has a name I can't racall but it's obsolete technology and doesn't exist now) consisted of a foil stamped and colored (black) 3 dimensional layer which had a clear laminate cover over it so the resulting finish was a soft gloss black, sunlight and weathering can make them appear more matte and faded over time.