My 79 is silver beige paint code 047 and I believe that was also available in 1980. As Bob has said I think bronco brown was the other choice on the early models. The lack of choice might have been something to do with the brown seat cover which wouldn't have looked right with black or blues. Come to think of it though I'm sure I've seen Henna red with the brown cover. Much more choice of colours from 81 on.
Edit: Yes if you put 1980 R65 into google images there are so many Henna Red ones that it must have been an original colour choice. There are also the odd ones in blue but they just look all wrong with the brown seat.