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(These are approximate)
 he numbering system is arcane, but there is a system to it. After 1965, the '?' is substituted by a letter representing the month in which the rod was made.
| Jan | F | July | G | | Feb | B | August | H | | Mar | C | September | J | | Apr | D | October | K | | May | E | November | L | | Jun | F | December | N | | So a rod made in March 1966 would be identified by the letters C/A, and one made in March 1986 as 1 C/A. | Year | Serial No. | Year | Serial No. | Year | Serial No. | | 1890-1891 | 13452-17196 | 1925 | D5932-D7375 | 1961 | H35184-H48465 | | 1892 | 17197-19000 | 1925 | E1045-E2030 | 1962 | H48466-H52737 | | 1893 | 19001-21660 | 1926 | E2031-E5882 | 1963 | H52738-H58199 | | 1894 | 21661-27498 | 1927 | E5883-E9435 | 1964 | H58200-H62932 | | 1885 | 27499-31705 | 1928 | E9436-E13508 | 1965 | H62933-H69100 | | 1896 | 31706-34956 | 1929 | E13509-E17685 | 1966 | ?/A | | 1897 | 34957-40187 | 1930 | E17868-E20904 | 1967 | ?/S | | 1898 | 40188-43929 | 1931 | E20905-E22530 | 1968 | ?/J | | 1899 | 43930-49019 | 1932 | E22531-E25275 | 1969 | ?/B | | 1900 | 49020-55066 | 1933 | E25276-E28278 | 1970 | ?/K | | 1901 | 55067-59440 | 1934 | E28279-E31422 | 1971 | ?/Z | | 1902 | 59441-95552 | 1935 | E31423-E35277 | 1972 | ?/O | | 1903 | 95553-101390 | 1936 | E35278-E39798 | 1973 | ?/C | | 1904 | 101391-101679 | 1937 | E39799-E45714 | 1974 | ?/Y | | 1904 | A1028-A5631 | 1938 | E45175-E49492 | 1975 | ?/L | | 1905 | A5632-A12935 | 1938 | E45175-E49492 | 1976 | ?/D | | 1906 | A12936-A19313 | 1939 | E49493-E52331 | 1977 | ?/X | | 1907 | A19314-A27256 | 1940 | E52332-E53644 | 1978 | ?/M | | 1908 | A27257-A35341 | 1941 | E53645-E55130 | 1979 | ?/Q | | 1909 | A35342-A44905 | 1942 | E55131-E56090 | 1980 | ?/H | | 1910 | A44906-A55752 | 1943 | E56091-E56399 | 1981 | ?/V | | 1911 | A55753-A66152 | 1944 | E56400-E56855 | 1982 | ?/E | | 1912 | A66153-A76109 | 1945 | E56856-E57900 | 1983 | F/W | | 1913 | A76110-A86335 | 1946 | E56901-E60708 | 1984 | ?/G | | 1914 | A86338-A94721 | 1947 | E60709-E63386 | 1985 | ?/T'?' | | 1915 | A94722-A100041 | 1948 | E63387-E67200 | 1986 | 1 ?/A | | 1916 | A100042-A1000158 | 1949 | E67201-E70990 | 1987 | 1 ?/S | | 1916 | B1021-B7889 | 1950 | E70991-E75100 | 1988 | 1 ?/J | | 1917 | B7890-B12146 | 1951 | E75101-E81000 | 1989 | 1 ?/B | | 1918 | B12147-B16425 | 1952 | E81001-E86200 | 1990 | 1 ?/K | | 1919 | B16426-B23556 | 1953 | E86201-E91000 | 1991 | 1 ?/P | | 1919 | C11-C186 | 1954 | E91001-E96202 | 1992 | 1 ?/O | | 1920 | C187-C10405 | 1955 | H101-H4600 | 1993 | 1 ?/C | | 1921 | C10406-C16732 | 1956 | H4601-H10121 | 1994 | 1 ?/Y | | 1922 | C16733-C25725 | 1957 | H10122-H14127 | 1995 | 1 ?/L | | 1922 | D171-D2041 | 1958 | H14128-H20678 | 1996 | 1 ?/D | | 1923 | D2042-D3399 | 1959 | H20679-H27533 | 1997 | 1 ?/X | | 1924 | D3400-D5930 | 1960 | H27535-H35183 | 1998 | 1 ?/M | |
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