cover 1939 underpaid envelopes (2) from India to Muar; one bears 1a. with Postage Due 1c. and 8c. alongside tied by Muar c.d.s. (1.1.40), the other bears India 1a. (2) with Postage Due 1c. (3, one damaged through opening) tied by c.d.s. A scarce pair