When have you ever heard of the postal rate dropping?
This early 20th century Christmas postcard cost a penny to send, which dates it sometime between 1907 and 1925. In 1872, the United States passed postal regulations allowing the mailing of postcards. The rate was 1 cent. The postcard rate went up to 2 cents in 1917 but went back down to 1 cent in 1919 until 1925.