Was the 40c really issued January 1, 1936?
This cover dates from March 31,1937. It is the earliest cover I have for this stamp. I find it printed on the first paper (the 1E1). I do not have any used specimens dated earlier than this cover. The stamp came into use mostly for the 1.45 pesos rate from the late 1930s.
[Blockierte Grafik: http://www.somestamps.com/images-arg3551/NAPEX/frame02/002724.jpg]