Cover with printed 'CANADIAN NACIONAL STEAMSHIPS' insignia on flap franked with 1929 5c carmine red and 1927 1c olive green TAX issue (SG 232 & 223) tied by PUERTO SAN JOSE ESCUINTLA cds dated 12 JUL 1936 with fine strike of undated 'POSTED ON THE HIGH SEAS T.S.S. "PRINCE DAVID" PURSER'S OFFICE' Ship cachet in black on front. Addressed to UK with GUATEMALA CITY transit mark on reverse.