Full gloss only pertains to urethane or enamel with hardener. Gloss as it pertains to lacquer is different. Lacquer does not achieve full gloss until it is cut and buffed. Out of the gun it is at a level higher than semi-gloss, and that depends upon reduction and conditions. Heater box covers are full gloss as it pertains to lacquer for instance.
I used to build custom furniture. A customer did not like the satin, catalyzed lacquer initially chosen for a tabletop and wanted it more glossy. I ran a buffer over it quickly and bingo, about 85-90% gloss. I did the same with a heater box cover that I added too much flattening agent. Buffed it out by hand to achieve the gloss it is supposed to be.
I hate relying on screen photos for accuracy, but unless someone polished the tailpanel adjacent to the trunk weatherstrip in Charlie's photo, I'd say that area was accurate for that particular car. That is not gloss but at the high end of semi-gloss.
Any flattened paint after decades of maintenance is anyone's guess.
Show me an untouched piece, unaffected by maintenance or UV rays and that is where the facts lie. But only for that particular car, not for every other one
manufactured.
Grab some black lacquer, throw it in your gun and shoot some test panels; then a better evaluation can be made.
