Registered airmail cover with typed 'BRITISH GUIANA - FRENCH GUIANA' and printed 'FIRST AIRMAIL' at top franked with 1921 1c green, 6c bright blue and 24c dull purple & green GV issue (SG 272, 276 & 278) tied by AIRMAIL G.P.O. cds's dated 31 DEC 1930. Flown on the Georgetown - Cayenne, French Guiana by PanAm with registration label and boxed 'G.P.O. BRITISH GUIANA FIRST FLIGHT' cachet on front. Addressed to CAYENNE with arrival cds on reverse. A rare flight with only 106 covers flown. (Muller #29, rated 1750pts)