i just looked up the may 2022 values of the coupe on Hagerty ... interesting to see the 2800cs starting to narrow the gap and show some significant increases.
1970 + 1971 2800cs
#1 - 175,000 (up 48.3%)
#2 - 121,000 (up 79.3%)
#3 - 65,500 (up 79.9%)
#4 - 37,800 (up 80%)
the 1972 + 1973 3.0cs
#1 - 192,000 (up 40.1%)
#2 - 148,000 (up 39.6%)
#3 - 84,200 (up 39.9%)
#4 - 44,900 (up 39.9%)
the 1974 3.0cs
#1 - 172,000 (up 39.8%)
#2 - 122,000 (up 39.4%)
#3 - 72,800 (up 39.7%)
#4 - 44,900 (up 39.9%)
the 1974 3.0csi
#1 - 194,000 (up 31.1%)
#2 - 147,000 (up 31.3%)
#3 - 79,300 (up 30.6%)
#4 - 54,400 (up 30.8%)