Registered airmail cover with 'FAB. DE CEMENTO DE "EL MELON" S.A.' imprint on flap franked with 1956 block of eight, block of four, pair and single 5p violet and pair 50p rose red AIR issue (SG 455 & 454) with 'ASIVA 1a Feria Industrial Vina del Mar' illustrated 'Hand with Wrench' cinderella label all tied by VALPARAISO ds's dated 2 JUN 1957 with black & white printed 'VALPARAISO R 14815 Fca. de C. de El Melon S.A.' registration label alongside. Addressed to UK with transit cds on reverse.