Incidently the One cent postcard became a 2 cent postcard from 1917-1919 due to WW I , after that it became 1 cent again , From 1920-1924 it was again 1 cent so the 1923 date "fits" that 4 year window, from 1925-1928 it was raised temporarily to 2 cents.
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jim@stinsonsports.com