Leica Lens Manufacture Dates Serial Number Range Year of  Manufacture No SN#-156,001 <1933 156,001-236,000 1934 236,001-284,600 1935 284,601-345,000 1936 345,001-416,500 1937 416,501-490,000 1938 490,001-538,500 1939 538,501-565,000 1940 565,001-582,294 1941 582,295-593,000 1942 593,001-594,880 1943 594,881--595,000 1944 595,001-601,000 1945 601,001-633,000 1946 633,001-647,000 1947 647,001-682,000 1948 682,001-756,000 1949 756,000-840,000 1950 840,001-950,000 1951 950,001-1,051,000 1952 1,051,001-1,124,000 1953 1,124,001-1,236,000 1954 1,236,001-1,333,000 1955 1,333,001-1,459,000 1956 1,459,001-1,548,000 1957 1,548,001-1,645,300 1958 1,645,301-1,717,000 1959 1,717,001-1,827,000 1960 1,827,001-1,913,000 1961 1,913,001-1,967,100 1962 1,967,101-2,015,700 1963 2,015,701-2,077,500 1964 2,077,501-2,156,300 1965 2,156,301-2,236,500 1966 2,236,501-2,254,400 1967 2,254,401-2,312,750 1968 2,312,751-2,384,700 1969 2,384,701-2,468,500 1970 2,468,501-2,503,100 1971 2,503,101-2,556,500 1972 2,556,501-2,663,400 1973 2,663,401-2,731,900 1974 2,731,901-2,761,100 1975 2,761,101-2,809,400 1976 2,809,401-2,880,600 1977 2,880,601-2,967,250 1978 2,967,251-3,013,650 1979 3,013,651-3,087,000 1980 3,087,001-3,160,500 1981 3,160,501-3,249,100 1982 3,249,101-3,294,900 1983 3,294,901-3,346,200 1984 3,346,201-3,383,200 1985 3,383,201-3,422,890 1986 3,422,891-3,455,870 1987 3,455,871-3,478,900 1988 3,478,901-3,503,150 1989 3,503,151-3,540,467 1990 3,540,468-3,583,830 1991 3,583,831-3,610,679 1992 3,610,680-3,644,475 1993 3,644,476-3,677,030 1994 3,677,031-3,730,290 1995 3,730,290-4,000,000 1996-Present These Dates are considered 99% accurate, there are always exceptions.