The 20cLC, 2 pesos and 5 pesos all look to be NGR (unwatermarked grid paper of 1945).
Poor centering is common for the NGR printings.
The 30c airmail is a clay paper printing.
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The 20cLC, 2 pesos and 5 pesos all look to be NGR (unwatermarked grid paper of 1945).
The 1 peso, 2 pesos, and 5 pesos stamps all look to be NGR (unwatermarked grid paper of 1945).
The first cover is from 1941 and only has New York receipt postmarks. This is a pre-Pearl Harbor cover and is therefore not censored.
Mailed express within Buenos Aires. The 2 pesos SO is rare on cover.
All stamps should be NGR.
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.