Netherlands Indies registered air mail letter (franking 25 ct. and 50 ct. and 1 and 2 gulden queen Wilhelmina) from Batavia-Centrum 2.12.41 to Zürich, (November 29 was the last flight of the China Clipper from Singapore before Pearl Harbor), from Singapore with the Horse Shoe route to Durban (South Africa), Durban-Lisbon by steamer and Lisbon-Zürich by train, just fl.3,75 rate for a letter between 15 and 20 grams