Registered cover franked with 1937 300rs black & orange, 300rs green, 200rs blue & brown, 400rs blue, 1938 1200rs multicoloured, 400rs violet & 400rs bluish green (SG 599, 601, 602, 609/610, 612 & 613) all tied by SAO PAULO cds's dated 16 IV 1938 with boxed registration markings on front & reverse. Addressed to KUCHING, SARAWAK, ASIA with typed 'VIA SINGAPORE' with various USA transit cds's plus SINGAPORE REGISTERED transit cds and KUCHING arrival cds all on reverse. Cover has a little light toning but a very rare destination.