I wondered about that myself. I think it was badly faded original paint, but I am not sure - it was in the desert for a long time before I bought it many years ago, so the obvious location of the emblem from when it fell off the car is there. Since I never saw another one, I don't know if it was a Brougham thing or not. The vinyl top had been replaced, though not well, and when they did, the Brougham emblems were not put back in place.
When I bought that car, it apparently had been sitting a long time in the California desert and the owner tried to start it up on the old gas. She ended up seizing two of the valves in the guides due to the varnish that built up when running the engine with old fuel. Thus two pushrods got bent, and it wasn't running well and making clanking noises from the loose push rods. She just wanted to get rid of the car and I had no trouble at all helping her out. One of my best scores, and when I went to actually see the car (there was little info in the listing and it just said Plymouth Fury), I was shocked to say the least. Got it home, got the valves freed up, put two new push rods in place, and it ran as smooth as any car I have ever had. I love the way those 383-4 packages drive with their higher stall speed converters than the 2 bbl versions. Bob got a nice car. He is already getting the seat covers made in the unique original pattern on those cars with material from SMS. I am looking forward to seeing him complete the restoration some day.