Argentina 1935-51 Definitives 20 Pesos 1L (Late) 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.
The 20 Pesos printed on white paper and with the first watermark had a very long printing run: from 1951 to approximately 1956. The frame is olive green on these, and the quality of the printing is coarse, smudged.
Below is a selection of 20P1L specimens I have come across in January of 2007
Below are three 20P1L specimens scans from the back.
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