5c red & blue 'San Martin' postal stationery airmail envelope (H&G FB1) used with added 1935 2c brown block of four, 3c green block of four and 1936 40c purple & mauve (SG 646, 647 & 658) tied by multiple strikes of ASTRA - CH (Chubut) cds dated 28 SEP 1938 with plain registration label tied by ASTRA cds alongside. Addressed to SWITZERLAND with arrival cds on reverse. A scarcer origination.