
to date your watch use the serial number of the movement!
Production numbers until 1880 are not in order so dating your early Illinois can be difficult
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Serial no. 1-2,000 2,411-2,550 3,001-3,700 4,001-4,360 4,401-4,470 5,001-5,500 2,301-2,410 2,551-2,720 3,701-4,000 4,361-4,400 4,471-5,000 5,501-6,840 7,001-10,000 2,001-2,100 2,721-2,830 6,841-7,000 2,101-2,160 21831-2,880 2,211-2,230 2,881-2,900 21201-2,210 2,231-2,250 2,261-2,270 2,901-3,000 51,401-51,650 58,001-59,000 96,401-102,400 112,101-118,600 50,601-50,700 51,651-51,700 54,901-55,200 57,001-57,800 118,601-133,900 150,301-154,900 46,001-48,000 50,701-51,000 55,201-57,000 57,801-58,000 61,001-61,300 65,001-66,000 69,401-88,100 102,801-102,900 133,901-150,000 154,901-162,000
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Date 1872
1873
1874
1875
1876
1877
1878
1879
1880
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Serial No. 162,001 235,000 310,000 390,000 470,000 552,001 672,000 792,000 912,000 1,030,001 1,075,000 1,120,000 1,165,000 1,210,000 1,255,000 1,300,001 1,350,000 1,400,000 1,450,000 1,500,000 1,550,000 1,600,000 1,650,000 1,700,000 1,749,801 1,844,000 1,938,000 2,032,000 2,126,000 2,220,000 2,314,000 2,408,000
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Date 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
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Serial No. 2,502,000 2,596,000 2,689,101 2,873,000 3,057,000 3,241,000 3,425,000 3,609,000 3,793,000 3,977,000 4,166,801 4,492,501 4,547,001 4,700,000 4,850,000 5,000,000 5,150,000 5,300,000 5,400,000 5,488,301 Moved to Hamilton 5,610,586 5,698,800
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Date 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1948 LAST Runs
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