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1983 Model Year
A John Deere model M tractor serial number plate is riveted onto the engine block on the left side of the tractor.
I would take a good guess that your tractor was made in 1969. To find out 101% sure, ask your John Deere dealer.
The best place to find a John Deere Model A tractor would be on the official John Deere site. Their site would give one information on where a tractor can be purchased.
The John Deere 850 is a compact tractor and the most recent model available is John Deere Z850A. This newer model offers more horsepower and hitching capability compared to the John Deere 850.
The most successful tractor model built by John Deere was the Dain All-Wheel-Drive. The most successful two-cylinder tractor produced by John Deere was the model A. The 730 was also very popular, as was the 4020.
It can tell you the year of the tractor and if you want to find out all you can, have it researched at http://www.twocylinder.com/research.htm
1952-1956
The first John Deere tractor, which was the John Deere-Dain, is at the Deere & Company Headquarters in Moline, IL. There are only two examples of this tractor known today. Most people think it was the John Deere Model D but the Dain was experimented with long before the D.
It will fit according to John Deere Attachment Fit Guide
600000
595700