By 'cents' I mean the values of the series that saw almost no postal use: the 4 centavos, 6 centavos, 8 centavos, and 12 centavos. The 2 1/2 centavos is also part of this 'cents' group.
The first cover is a 55 centavos ship rate which is not like the other rates I have from the same time period.
The second cover circulated to Buenos Aires by air mail, and has 36 centavos in postage,
