Printed 'Muestra sin valor enviada por G.L. CHANANGE, Guayaquil' sample envelope with manuscript 'Aroz Blanco' at top (containing a sample of white rice) franked with 1930 10c olive green & orange 'National' issue and SCADTA 1929 pair 1s rose red (SG 477 & 14) tied by GUAYAQUIL SCADTA cds's dated 9 II. 1931 with green 'Scadta' airmail label alongside. Addressed to COLOMBIA with BUENAVENTURA SCADTA transit cds on reverse and CALI SCADTA arrival cds on front. A rare rate flown by Scadta.