This stamp was issued January 1, 1936, and here is a cover from January 4.
![Imagen](http://www.somestamps.com/images-arg3551/reference-collection/book01/000049-1PL-049-C-back.jpg)
This is the first paper (1E1):
![Imagen](http://www.somestamps.com/images-arg3551/issue-pages/1P/000056-1PL-056-M-wmk-350.jpg)
There are two catalogued plate varieties in Klass/Kneitschel:
long vertical line across argentina section of map
![Imagen](http://www.somestamps.com/images-arg3551/issue-pages/1P/000009-1PL-009-U-PV-long-scratch-det-350.jpg)
retouched left numeral background
![Imagen](http://www.somestamps.com/images-arg3551/issue-pages/1P/000070-1PL-070-U-numeral-highres-det350.jpg)
there is an additional plate variety I find, and it seems to be in one of the master dies because I find two variations:
the most common has a broken curl midway along the right side edge,
![Imagen](http://www.somestamps.com/images-arg3551/reference-collection/book01/000067-1PL-067-U.jpg)
here is a detail
![Imagen](http://www.somestamps.com/images-arg3551/reference-collection/book01/details/000067-1PL-067-U-dert.jpg)
the second variation also has a line break that I find in two separate specimens (one on cover).
![Imagen](http://www.somestamps.com/images-arg3551/reference-collection/book01/000055-1PL-055-M-PV-UL.jpg)
here is the detail
![Imagen](http://www.somestamps.com/images-arg3551/reference-collection/book01/details/000055-1PL-055-M-PV-UL-det2.jpg)
for those who can read Spanish, I also have scans of the three major catalogs for the regular issues and the officials in Kneitschel (the most authoritative source, it seems):
Ediphila 1980:
http://www.somestamps.com/domain-argent ... iphila.htm
Kneitschel 1951:
http://www.somestamps.com/domain-argent ... tschel.htm
Klass 1970:
http://www.somestamps.com/domain-argent ... /klass.htm
Officials in Kneitschel:
http://somestamps.com/domain-argentina/ ... icials.htm