cover SLOGAN POSTMARKS: A selection with 1918 stampless envelope bearing framed "BUY WAR BONDS/THROUGH THE/H.K. & S.CHINA/WAR SAVINGS ASSN/HONG KONG", British War Organization Fund label and P.O.W. parcel insert, 1939-41 slogan postmarks with framed "REMEMBER/THE BRITISH WAR/ORGANISATION FUND" (3), "ARE YOU SUPPORTING/THE BRITISH WAR/ORGANIZATION FUND" and "BUY/BOMBERS" (2), good to fine. (9)