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 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 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.
1952-1956
1983 Model Year
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
A John Deere model M tractor serial number plate is riveted onto the engine block on the left side of the tractor.
The first John Deere tractor to be sold at reputable dealers was the Model D, which was first sold in 1923. For more info on the Model D, see the related link...
The first tractor with the John Deere name on it was the Dain model, which wasn't very successful. It was manufactured in 1918. Between 1918 and 1923 the tractors were manufactured under the Waterloo Boy name that was already being used by a company they purchased, In 1923 they began manufacturing the John Deere Model D. They were all manufactured in Illinois.
The John Deere company themselves offers these tractors. Their website allows a consumer to buy their vehicles, including the model 300 tractor. The price of the tractor itself is around $100,000.