South Africa. (Netherlands East Indies). 1950. Air Mail envelope addressed to Sourabaja, Netherlands East Indies bearing South Africa SG 62, 1s blue and brown tied by Johannesburg date stamp '24th Jan 50' , underpaid with octagonal 'T/ 25c' hand-stamp and bearing Netherlands East Indies postage due SG D449, 20c salmon and SG D490, 2 1/2d brown (pair) tied by Soerabaja date stamp '3/2'. Attractive cover.