Antigua 1940 St John's REG Airmail Sent to the United States via Puerto Rico, Bearing 1Shilling, 2½d, 2d KGVI Adhesives with Censor Handstamp Miller Type S1 with "2" added  in blue manuscript; this censor handstamp was in use from Nov 1939 until late September 1941.  (2-5776)