1968 John Deere 4020 Diesel. This tractor sold at an auction in western Iowa on Saturday. The farmer told me he had bought it new in Aug. of 1968 for $6200. It was the last thing to sell on his auction, and it was quite something to witness. He was broken up, and you could have heard a pin drop as the auctioneer slowly worked his way up to $18,500. What an icon of American farming! I was glad to be able to watch it sell.