1936 John Deere Model AR. Keystone Truck & Tractor Museum, Colonial Heights, Va. The AR/AO was the “regular” or fixed tread version of the Model A. The AR was the fixed tread version for general use, the AO was the orchard version. From 1936 until 1941, an AI industrial model was also made. The 1951 price for the AR was $2,300.