When buying a used Schneider lens for your view camera, you can use the lens serial number to determine the approximate age of the lens (that is, when it was manufactured) from this table:

    Serial Number    Approximate Date  

         30,000        Dec 1919
         40,000        May 1920
         50,000        Jan 1922
        100,000        Jan 1925
        200,000        Jun 1928
        300,000        Feb 1929
        400,000        Apr 1931
        500,000        Jun 1932
        600,000        Aug 1933
        700,000        Oct 1934
        800,000        Sep 1935
        900,000        May 1936
      1,000,000        Nov 1936
      1,200,000        Dec 1937
      1,400,000        Nov 1938
      1,600,000        Sep 1939
      1,800,000        Jun 1942
      2,000,000        Sep 1948
      2,200,000        Jul 1949
      2,400,000        Oct 1950
      2,600,000        May 1951
      2,800,000        Nov 1951
      3,000,000        May 1952
      4,000,000        Oct 1954
      5,000,000        Feb 1957
      6,000,000        May 1959
      7,000,000        Feb 1961
      8,000,000        Mar 1963
      8,500,000        Feb 1964
      9,000,000        Feb 1965
      9,500,000        Sep 1965
     10,000,000        Jan 1967
     10,500,000        Oct 1967
     11,000,000        Nov 1968
     11,500,000        Jul 1970
     12,000,000        Sep 1972
     12,500,000        Mar 1974
     13,000,000        Dec 1976
     13,200,000        Sep 1977
     13,400,000        Oct 1978
     13,600,000        Oct 1979
     13,800,000        Jan 1981
     14,000,000        Oct 1983
     14,100,000        Jan 1985
     14,200,000        Aug 1986
     14,300,000        Nov 1988
     14,400,000        Jan 1981
     14,460,000        Feb 1992
     14,480,000        Jan 1993
     14,500,000        Nov 1993
     14,510,000        Jan 1994
     14,520,000        May 1994
     14,540,000        Jan 1995
     14,560,000        Apr 1995
     14,590,000        Jan 1996
     14,600,000        Apr 1996
     14,620,000        Nov 1996
     14,730,000        Apr 2000

Based on information found at http://www.schneideroptics.com/large/Vintage/large%20format/serial.htm

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