How to determin the age of a compur shutter

Kammerawerken etui 6,5x9cm - 1921

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.

Year – Serial number
1920 450000
1922 500000
1925 600000
1926 750000
1927 850000
1928 950000
1929 1000000
1930 1150000
1931 1500000
1932 1800000
1933 2250000
1934 2700000
1935 3200000
1939 5400000
1947 6000000
1948 6200000
1949 6500000
1950 7000000
1951 7700000
1952 8500000