United States. (Netherlands East Indies). 1941. United States postal stationery card 'one cent' green upgraded with "Prexie" SG 800, 1c apple-green tied by cork obliterator with boxed slogan dated 'Oct 17 1941', written from 'Harvard Medical School' from the Department of Tropical Medicine addressed to Batavia, Dutch East Indies, underpaid with 'T/ S.P. Calif/ Centimes 10' duplex in violet with large circular 'Ec. C. and 'Dev/ 11' with hand-stamp 'Gecensureerd'/ 4' in carmine applied in Batavia.
Very nice item of uprated postal stationery paying the printed matter rate to Asia with 'Prexie' usage.