Great Britain. (Netherlands East Indies). 1936. Air Mail envelope addressed to Java, Netherlands East Indies bearing Great Britain SG 426, 6d purple tied by London roller '17th Dec 36' with framed instructional 'Insufficiently Paid For/ Transmission By Air Mail' in violet in face, endorsed 'via Amsterdam' , underpaid with boxed 'T' hand-stamp and bearing Netherlands East Indies postage due SG D231, 10c salmon and SG D239, 50c salmon tied by Dampit arrival '4th Jan 37' on face. Very attractive item.