First it was taken to Oahu and postmarked at Honolulu on May 18. Then it went to Kauai and was postmarked at Kapaa and Koloa. Back it went to Honolulu on August 3 and then down to Hawaii where it was postmarked at Hilo. Postmarks must include the name of a post office, by my definition.
Postmarks used at Honolulu constitute a separate study.
See Honolulu Postmarks . Honolulu postmarks appeared in November, 1850. Many early marks used at the country offices are really cancels and thus are covered in the study of Cancels . Finally, marks falling within the broad definition of auxiliary marks are dealt with in Auxiliary Marks . The culmination of their effort is Part III of Meyer and Harris.