Correio marítimo. Açores. Correio de boia. Sobrescrito circulado com selos CE768, 1$00 (Cavaleiro Medieval) + CE1092 + CE1080, da Horta (24.05.71) para os EUA. No interior carta timbrada da TS Hanseatic manuscrita " This was mailed on the "T.S. Hanseatic" on sun May 23, 1971 at 10:00 AM by a mail buoy thrown overboard near Faial in the Azores". Carimbo batido a violeta "MAIL BUOY / SS — HANSEATIC / HORTA FAYAL / POST BOJE".