United States rates were reduced substantially, effective July 1, 1863. Word of the new rates reached Honolulu
August 30, 1863. The first mail bags made up by the Honolulu post office at the new rate were sent September 9,
1863, carried by the American bark Comet, sailing September 10. During the interim between July 1 and August 30,
the Honolulu post office charged mail sent to San Francisco at the higher rates of the Middle Treaty Period.
This Period and the entire Treaty Period comes to a close on June 30, 1870 and a new Postal Convention between
Hawaii and the United States took effect July 1, 1870. The last recorded mail of the Treaty Period was postmarked
at Honolulu on June 23, 1870.
During the Late Treaty Period, the United States rate was 3¢ per half ounce (exclusive of the 2¢ ship fee),
prepaid, or 6¢ per half ounce (including the ship fee), collect. When contract steamship service between Honolulu
and San Francisco was inaugurated by the United States in September, 1867, a special rate for mail carried by the
steamer was imposed at 10¢ per half ounce (no ship fee was charged on mail carried by a contract vessel), prepaid
or collect. Mail carried by means other than one of the monthly steamers still was charged at the lower 3¢ plus 2¢
rate. See Mail Rates.
Despite the simplicity of rates during the Late Treaty Period, mistakes, confusion and dual rates require us to
break the Late Period into six sub-Periods for better understanding: