Argentina 1935-51 Definitives 20 Pesos NOP Issue

The Argentina 1935-51 20 Pesos is one of the great high value definitives of the 20th century. The early printings are extremely rare on cover, and the later printings were in use when the stamp was still a mid-range high value. There is a postal forgery of this stamp.
The 20PNOP is printed on white and opaque unwatermarked paper. This stamp is sometimes found with comb-like perforations, as shown below right.
Below is a selection of 20PNOP specimens I have come across in January of 2007
From this sample I find a specimen postmarked in 1956

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