Peter, when I saw you had a new post in this thread, I thought it was going to be about picking up the 1965 Lampo Jim Clark that ended last night. LOL. I have bought from that seller before, and he does have some neat oddball racing cards, since he is based in Italy. The final price of $1,027 was very strong. I remember a Lampo Clark from the same seller a few months ago that ended in the $400 range.
https://www.ebay.com/itm/175358716539
With regard to speculating on prices down the road, I think Max Verstappen is worth loading up on. I know there is a huge danger in buying cards of current athletes, but he is already eighth in career F1 wins at age 24. With the season seemingly going to stay at 21-22 races for the foreseeable future, he has so many more chances to win races than drivers from even one generation ago.
IMO, Hamilton's seven titles and 103 wins are already fully priced into his cards.