United States rates were reduced substantially effective July 1, 1863. Word of the new
rates reached Honolulu August 30, 1863 and the first mail bag made up by the Honolulu
post office at the new rate was the mail of September 9, 1863, carried by the American
bark Comet, departing 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 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 brought by a contract vessel),
prepaid or collect. Mail carried by means other than one of the monthly steamers still
was charged at the lower rate. See Mail Rates.
Despite the simplicity of rates during the Late Treaty Period, mistakes, confusion and
dual rates during the steamer period require us to break the Late Period into six
sub-Periods for better understanding: