Malaya. (Netherlands). 1931. Air Mail envelope addressed to Penang bearing Netherlands Yvert 139, 6c orange/ brown and Yvert 147, 30c lilac tied by S'Gravenhague double ring '4th Aug 31', underpaid with 'T' tax hand-stamp and bearing Straits Settlements postage due SG D3, 4c green and SGD5, 10c orange tied by Penang double ring 'Au 15'. Nice item of underpaid mail to Straits Settlements.