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serial number	year	serial number	year	serial number	year
9,000	1867	7,000,000	1897	30,050,000	1927
25,000	1868	7,495,000	1898	31,599,000	1928
40,000	1869	8,000,000	1899	32,000,000	1929
50,000	1870	9,000,000	1900	32,599,000	1930
185,000	1871	9,300,000	1901	33,000,000	1931
201,000	1872	9,600,000	1902	33,700,000	1932
325,000	1873	10,000,000	1903	34,558,000	1933
400,000	1874	11,000,000	1904	35,000,000	1934
430,000	1875	12,000,000	1905	35,650,000	1935
480,000	1876	12,500,000	1906	36,200,000	1936
520,000	1877	13,000,000	1907	36,978,000	1937
570,000	1878	13,500,000	1908	37,900,000	1938
625,000	1879	14,000,000	1909	38,200,000	1939
750,000	1880	15,000,000	1910	39,100,000	1940
900,000	1881	16,000,000	1911	40,200,000	1941
1,000,000	1882	17,000,000	1912	41,100,000	1942
1,250,000	1883	17,339,000	1913	42,200,000	1943
1,500,000	1884	18,000,000	1914	42,600,000	1944
1,855,000	1885	18,587,000	1915	43,200,000	1945
2,000,000	1886	19,000,000	1916	44,000,000	1946
2,500,000	1887	20,031,000	1917	45,000,000	1947
3,000,000	1888	21,000,000	1918	46,000,000	1948
3,500,000	1889	22,000,000	1919	47,000,000	1949
4,000,000	1890	23,000,000	1920	48,000,000	1950
4,449,000	1891	24,321,000	1921	50,000,000	1951
4,600,000	1892	25,100,000	1922	52,000,000	1952
5,000,000	1893	26,050,000	1923	53,500,000	1953
5,500,000	1894	27,000,000	1924	54,000,000	1954
6,000,000	1895	28,421,000	1925	54,500,000	1955
6,500,000	1896	29,100,000	1926	55,000,000	1956

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These are approximate production dates. Oftentimes, a block of serial numbers would be assigned and the movement plates blanked out; then the plates would be stored in the warehouse and finished as demand required. So, it is possible that a watch could have been completed some years after the serial number date.