John Deere introduced three new models of tractors in 1970 for the 1971 model year. The 4320 and 4620 were 2-wheel-drive, row-crop tractors, rated at 115 and 135 PTO horsepower, respectively.

Here’s a picture of the record setting, rare, John Deere 4320 front-wheel assist, sold for $51,500 on June 2014 collector auction I covered in southwest Iowa, amazing sale by our friends at Polk ...