5 BIT King Christian X single postal card (Engström PC17B) from Christiansted 26 January 1916 to St. Thomas. Cancelled with four ring cancel no dot when arriving at St. Thomas post office by the mail boat. On reverse origin mark large 'C' struck and datestamp 'ST. THOMAS 27/1 1916', large 'C' rarely found and this is a clean and clear strike.