Sunroof Dart (1973) Question???

I sold my nice but not perfect Basin Street Blue 1973 Duster 340-4spd-3.55sg sunroof/fold down rare seat car three years ago for $15,000. I would consider the sunroof cars rare as production numbers for them would probably have been 1-2% range. When I took mine to shows most people didn't know they produced them with sunroofs back in the "old" days. In the 8 years I had mine I never saw another one in the greater St. Louis area.