That is my thought too. In your original pic the top emblem seems to have a similar finish. The one I pictured in unrestored oe.
I'd recomend trying various satin or semi-gloss spray bombs. Or black and varying %'s of flattener through a air brush or detail gun.
I noticed in your pic the frame to the rectangular text frame is black on two emblems and chrome on the last. Mine would indicate chrome is correct, unless separate part runs were masked differently. Finally the red appears sprayed vs flooded paint.
Agree on the chrome border around the middle. The two of mine that have the 'frame' painted black look like someone tried to refinish them at some point. Why would the designers put that little edge in there if they were going to hide it under black paint?
Also, the red R/T letters are different shades - the one on the the bottom is less orange than the one in your pic. Maybe the 'sprayed' look you alluded to comes from a stamp or similar procedure? R/T door emblems lasted two years, perhaps by the end of the run the stamp was getting worn out?
Since I have three I'm going to strip them clean and start from scratch. That way if I screw it up I can take a mulligan and try again.