Definitive Postage Stamps of Malaya - Philatelic Database
The rare combination of Chop II (Type 1, Singapore) on the beautiful $5 on green paper was for fiscal use only. Before the war, the $1, $2 and $5 (the largest denomination) had chiefly been for air mail. Probably Type 3 (Kuala Lumpur) of Chop II. This denomination (40c) was used exclusively in Sumatra which was not geographically part of Malaya.