Letterbooks containing letters sent from Butterfield & Swire offices in the East to John Swire and Sons London office and letters sent from John Swire and Sons London to Butterfield & Swire staff in the East. The letters concern staff including staff reports.
The early volumes are compiled separately of letters sent out East from the London office (spanning a period of a few years), or received in to the London office from Butterfield & Swire in the East (covering a period of a year). In later volumes (from 1936) both 'Out' and 'In' letters are complied in a single volume.