A striking early airmail issue from the Repoeblik Indonesia, featuring a classic tropical scene with soaring palm trees and a propeller aircraft passing overhead. Printed in Vienna (Staatsdruckerei Wien) during the Indonesian independence struggle, this stamp reflects the transitional period when Indonesia relied on foreign printers. The bold 40s denomination served expedited airmail services, and the design is admired for its elegant Art-Deco border and atmospheric coastal landscape. A desirable piece for collectors of early Indonesian postal history and aviation-themed issues.