IWC, datation par le No de série du mécanisme
28,251 – 49,300 = 1887 – 1890
49,301 – 117,300 = 1890 – 1895
117,301 – 211,200 = 1895 – 1900
211,201 – 321,300 = 1900 – 1905
321,301 – 463,600 = 1905 – 1910
463,601 – 620,800 = 1910 – 1915
620,801 – 742,300 = 1915 – 1920
742,301 – 807,400 = 1920 – 1925
807,401 – 919,600 = 1925 – 1930
919,601 – 940,000 = 1930 – 1935
940,001 – 1,013.200 = 1935 – 1940
1,013.201 – 1,092,400 = 1940 – 1945
1,092,401 – 1,200,400 = 1945 – 1950
1,200,401 – 1,335,400 = 1950 – 1955
1,335,401 – 1,513,000 = 1955 – 1960
1,513,001 – 1,778,800 = 1960 – 1965
1,778,801 – 1,970,200 = 1965 – 1970
1,970,201 – 2,265,400 = 1970 – 1975
IWC, datation par le No de série de la boîte
0 – 10’000 = 1880 – 1886
10,001 – 50,000 = 1886 – 1890
100,000 – 200,000 = 1890 – 1899
200,001 – 300,000 = 1899 – 1903
300,001 – 400,000 = 1903 – 1907
400,001 – 600,000 = 1907 – 1913
600,001 – 800,000 = 1913 – 1924
800,001 – 900,000 = 1924 – 1929
900,001 – 1,000,000 1929 – 1938
1,000,001 – 1,100,000 = 1938 – 1945
1,100,001 – 1,500,000 = 1945 – 1960
1,500,001 – 2,000,000 = 1960 – 1972
1,500,001 – 2,000,000 = 1960 – 1972
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Contraria contrariis curantur. (Les contraires se guérissent par les contraires).