To a novice, these two covers are common, but to someone who studies this series, these are rare covers indeed. The 10c Rivadavia Brown, from the perspective of all of the printings, saw heavy use, but this very first batch on thin clay paper, used in 1939, saw seldom use.
18: 1.15 pesos to Canada.
19: 1.15 pesos to the United States.
