All stamps should be NGR. Curiously, the 30c airplane airmail looks to be a clay printing.
These two guides are found on the bottom stamp.
This guide is found on the top stamp.
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All stamps should be NGR. Curiously, the 30c airplane airmail looks to be a clay printing.
The first cover has a pair of 5pNGR for a rate of 11.40 pesos.
The first cover has a single 5pNGR for a 5.10 pesos rate.
The first cover has an unreadable date, and it is likely a 2 pesos NGR from 1946-47.
The first cover has a single 2 pesos stamp, most likely NGR, and was mailed in 1947.