When I first got into retros, I was very curious of the colors of them. The color of the ones out in the field year after year. So I spent a few days looking through the archives trying to find the largest resolution color photos and their source I could find. These are the ones I collected. (You can right click on each picture and open in new tab to see full size image)
I am sure some of these have already been posted.
Pictures taken 1965
https://imgur.com/a/d83oSMh
Pictures taken 1966
https://imgur.com/a/wGQFNng
Pictures taken 1967
https://imgur.com/a/Lm24sjn
Pictures taken 1968
https://imgur.com/a/Yq7CrCR
Pictures taken 1969
https://imgur.com/a/SB5EyAp
Pictures taken 1970-79
https://imgur.com/a/dsfKnbv
Pictures taken mostly 1980 -89
https://imgur.com/a/KVE4F9a
1965 - 1990 year by year
https://imgur.com/a/CkQAh17
Random pictures I could not verify the year taken
https://imgur.com/a/KxLq1hw
Authentic pre 1986 from Rock Island Auctions
https://imgur.com/a/0vbVeiY