Oil-Cooled & Hopper-Cooled Engines
1904 = 101
1905 = 301
1906 = 1000
1907 = 2100
1908 = 4400
1909 = 4900
1910 = 5200
1911 = 5500
1912 = 6000
1913 = 10000
1914 = 14000
1915 = 18000
SN 20000 – 49999 were farm pump engines
1915 = 50000
1916 = 52000
1917 = 55000
1918 = 61000
1919 = 66000
1920 = 70000
1921 = 75000
1922 = 77000
1923 = 80000
1924 = 87000
1925 = 93000
1926 = 99000
SN 100000 – 159999 were farm pump engines
1926 = 160000
1927 = 163000
1928 = 167000
1929 = 172000
1930 = 177000
1931 = 179000
1932 – 1935 = 181000 – unknown
Farm Pump Engines
1909 = 20000
1910 = 21000
1911 = 24000
1912 = 28000
1913 = 32000
1914 = 38000
1915 = 46000
1916 = 100000
1917 = 102000
1918 = 104000
1919 = 107000
1920 = 110000
1921 = 113000
1922 = 115000
1923 = 116000
1924 = 118000
1925 = 119300
1926 = 120700
1927 = 122400
1928 = 123100
1929 = 124500
1930 = 125000
1931 = 125400
1932 – 1954 = 126400 – unknown
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