Cover franked on reverse with single 1957 1s bronze green 'Galapagos' issue (SG 3) tied by fine strike of undated CORREO DEL ECUADOR SAN CRISTOBAL ARCHIPELAGO COLON cds in bright magenta with second strike on front with additional 'JUN 29 1957' date handstamp. Addressed to GUAYAQUIL, unclaimed with 'REZAGOS' in red crayon and second 'MAYO 2 1958' datestamp applied on return to the Galapagos. A rare commercial item.