Dates for Series 20-30
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A limited number of copies of the AMERICAN DIGEST OF BUSINESS MACHINES (1924) is available.  Use the link on the home page to find out how to get your copy.

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Dates for Series F Dates for Series 20-30 Dates for Series 100-300 Dates for Series J Dates for Portables Age by Serial Number Model / Serial Cross Reference

Manufacture Dates For Class 20-30 Typewriters

YearSerial Start - 20-30
19281231863
19291319274
19301416607
19311466212
19321498990
19331518405
1934A18973
1935A66515
1936A115072
1937A181674
1938A255816
1939A282972
1940A335337
1941A388652
1942A481059
1943A526983
1944A549549
1945A581123
1946A623623
1947A679059
1948A766700
1949A879426
1950A996412
1951B83781
1952B215737
1953H3850D
1954H6401D
1955H7423D

Courtesy of the Charles Babbage Institute, University of Minnesota, Minneapolis