How to determine the age of a Schneider lens

Samsung GX-1L + Schneider-Kreuznach 18-55mm (KAF mount)

This is information that I have collected over the last few years from a number of sources. Some of those sources contradict each other so I have had to make decisions as to what I wish to keep. I cannot guarantee its accuracy.

The date a lens or shutter is made is not always the date the camera was made.  Both lenses and shutters are made and sold to camera manufacturers in batches.  A camera made in one year may have a lens made the previous year. It is also possible that either the shutter or the lens is a later addition made by a repairer.

Schneider Lens Serial numbers  VS Serial Number Date

30,000 December 1919
40,000 May 1920
50,000 January 1922
100,000 January 1925
200,000 June 1928
300,000 February 1929
400,000 April 1931
500,000 June 1932
600,000 August 1933
700,000 October 1934
800,000 September 1935
900,000 May 1936
1,000,000 November 1936
1,200,000 December 1937
1,400,000 November 1938
1,600,000 September 1939
1,800,000 June 1942
2,000,000 September 1948
2,200,000 July 1949
2,400,000 October 1950
2,600,000 May 1951
2,800,000 November 1951
3,000,000 May 1952
4,000,000 October 1954
5,000,000 February 1957
6,000,000 May 1959
7,000,000 February 1961
8,000,000 March 1963
8,500,000 February 1964
9,000,000 February 1965
9,500,000 September 1965
10,000,000 January 1967
10,500,000 October 1967
11,000,000 November 1968
11,500,000 July 1970
12,000,000 September 15, 1972
12,500,000 March 1974
13,000,000 December 1976
13,200,000 September 1977
13,400,000 Ocotober 1978
13,600,000 October 1979
13,800,000 January 1981
14,000,000 October 1983
14,100,000 January 1985
14,200,000 August 1986
14,300,000 November 1988

14,400,000 January 1991
14,460,000 February 1992
14,480,000 January 1993
14,500,000 November 1993
14,510,000 January 1994
14,520,000 May 1994
14,540,000 January 1995
14,560,000 April 1995
14,590,000 January 1996
14,600,000 April 1996
14,620,000 November 1996
14,730,000 April 2000