A letter from Rev. Lorenzo Lyons, postmaster at Waimea, Hawaii to Rev. Sereno Bishop at Lahainaluna, Maui bearing the Kawaihae type 244.02 postmark dated April 26 and docketed in the year 1872. The Scott No.
Cancels can include postmarks, if the stamp was canceled by the postmark.
Often, the stamps were cancelled with a separate device. Not all postmarks were used as cancels, particularly in the early days of the postal service. Even in later years, use of postmarks to cancel stamps was discouraged because the stamp could be obliterated more effectively with a separate cancel. For a discussion of Postmarks, see Town Postmarks or Honolulu Postmarks . The only published comprehensive study of cancels is by William J. Davey, found at Meyer and Harris, pages 279 to 283 and 294.