D) 1974, GREAT BRITAIN, CIRCULATED LETTER FROM GREAT BRITAIN TO THE U.S.A, AIR MAIL, WITH MEDIEVAL C

D) 1974, GREAT BRITAIN, CIRCULATED LETTER FROM GREAT BRITAIN TO THE U.S.A, AIR MAIL, WITH MEDIEVAL CAVALRY STAMPS, ROBERT THE BRUCE, EARL OF CARRICK 4.1/2P, OWAIN GLYNDWR. PRINCE OF WALES 5.1/2P, XF