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serial number	year	serial number	year	serial number	year
1 - 2,000	1893	790,000	1910	2,200,000	1927
5,000	1894	860,000	1911	2,250,000	1928
11,500	1895	940,000	1912	2,300,000	1929
16,000	1896	1,000,000	1913	2,350,000	1930
27,000	1897	1,100,000	1914	2,400,000	1931
50,000	1898	1,200,000	1915	2,440,000	1932
74,000	1899	1,300,000	1916	2,480,000	1933
104,000	1900	1,400,000	1917	2,520,000	1934
143,000	1901	1,500,000	1918	2,560,000	1935
196,000	1902	1,600,000	1919	2,600,000	1936
260,000	1903	1,700,000	1920	2,900,000	1937
340,000	1904	1,800,000	1921	3,200,000	1938
435,000	1905	1,900,000	1922	3,400,000	1939
500,000	1906	2,000,000	1923	4,=00,000	1940
580,000	1907	2,050,000	1924	4,250,000	1941
680,000	1908	2,100,000	1925	4,500,000	1942
750,000	1909	2,150,000	1926

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Grade 992B with letter "C" preceding the serial number.

serial number	year	serial number	year	serial number	year
C001	1940	C170,000	1946	C420,000	1954
C40,000	1941	C215,000	1947	C455,000	1956
C60,000	1942	C255,000	1948	C500,000	1959
C90,000	1943	C350,000	1950	C520,000	1964
C120,000	1944	C390,000	1951	C529,000	1969

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Grade 950B with"2B" preceding the serial number.

serial number	year	serial number	year	serial number	year
2B001	1941	2B400	1942	2B800	1943

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Grade 950B with the letter "S" preceding the serial number.

serial number	year	serial number	year	serial number	year
S001	1941	S4,500	1947	S25,000	1955
S1,500	1944	S6,500	1948	S28,000	1962
S2,800	1945	S7,500	1949	S30,000	1965
S4,000	1946	S10,000	1951

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Grade 4992B with"4C" preceding the serial number.

serial number	year	serial number	year	serial number	year
4C0001	1941	4C90,000	1944	4C135,000	1960
4C40,000	1942	4C120,000	1950	4C145,000	1968

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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.