JD Lawn & Garden Tractor Forum
Here are the serial number breakdowns for the 300 serial tractors.
300 Serial Numbers:
1975 = 30,001 - 55,000 (16hp Kohler Engines)
1976 = 55,001 - 70,000 (16hp Kohler Engines)
1977 = 70,001 - 80,000 (16hp Kohler Engines)
312 Serial Numbers:
1977 = 70,001 - 80,000 (12hp Kohler Engines)...