Thank you for the information about the first set change in September of 1972, and the two shades of green used on the carpet...Seems like the set went through a lot of changes at the start of Season 13...The carpet color and border color slight change...The more recognizable showcase podia, the pink borders around contesants' row, and the change in the leader board on the big wheel from the "sportstype" (similar to contestants' row) to "vane" (like the time readouts on the DeLorean in Back to the Future)....
You and I are about the same age, and I remember being utterly bewildered when Bob's hair first turned white in late 1987, then was dark for most of December (as reruns were aired from the previous season)... Bob had white hair for the rest of Season 16, before it went back to dark for a few weeks in July 1988 (Which really confused me because Bob's hair was white few weeks earlier when Ray Combs made a guest appearance to promote the return of Family Feud)....(Feud was already Price's lead-in by the last dark haired Bob reruns)....Same with the big wheel design and Temptation's color scheme (The Pink debuted around the same time as the Superball pattern of the big wheel) though it alternated back and forth several times during the end of the season and summer reruns....