1943 Double Censored Cover to Switzerland

 The cover received US and German censorhip. The stamps add up to 1.65 pesos. The cover is supposed to have travelled to South Africa (Natal), then to Bolama off the coast of Guinae-Bissau in West Africa, then to Portugal (was the US censorship applied in Portugal?). There are no markings enroute.

The 50c airmail is consistent with a clay printing.

The 30c and 40c values should be 1E3.

Three 1942-3 Covers to Brazil

 These have Brazilian censorship tape applied upon receipt. I am unable to guess the papers for these stamps because 1943-44 has the 1E3 and 2D papers that look very similar on cover. The first cover bears a 40c value and a 20cLC value.

The second cover has a pair of 40c values and a 5c stamp. 

The third cover bears a single 40c value.

A 1945 5 pesos large format cover to Switzerland

 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.

A 1946 5 pesos large format cover to the US

 The 1 peso, 2 pesos, and 5 pesos stamps all look to be NGR (unwatermarked grid paper of 1945).

The 2 pesos has guide marks.

The 5 pesos has plate variety marks.

Two 1941 2 pesos large format covers to the US

 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.

This second cover is also from the same time range.

1946 large format official cover

 Mailed express within Buenos Aires. The 2 pesos SO is rare on cover.

Guide on the left stamp.

Guide on the right stamp.

1947 1 peso large format cover to the US

 All stamps should be NGR.

This plate variety is found on the lower left stamp.

This plate variety is found on the lower right stamp.

This plate variety is found on the upper right stamp.