How to recognize them and is that all???
The parallel watermark with symmetrical paper wire - English paper papel inglés - direction of paper parallel to the long side of the stamp "M":
![Imagen](http://www.galeoptix.nl/fila/argentina/thumbs/arg_1939_5c_livestock_symm_para_M_00.jpg)
![Imagen](http://www.galeoptix.nl/fila/argentina/thumbs/arg_1939_5c_livestock_symm_para_M_02.jpg)
The orthogonal watermark with symmetrical paper wire - Dutch paper papel holandés - direction of paper parallel to the long side of the stamp "M":
![Imagen](http://www.galeoptix.nl/fila/argentina/thumbs/arg_1939_5c_livestock_symm_ortho_M_00.jpg)
![Imagen](http://www.galeoptix.nl/fila/argentina/thumbs/arg_1939_5c_livestock_symm_ortho_M_02.jpg)
The orthogonal watermark with symmetrical paper wire - Dutch paper papel holandés - direction of paper parallel to the short side of the stamp "m":
![Imagen](http://www.galeoptix.nl/fila/argentina/thumbs/arg_1939_5c_livestock_symm_ortho_mi_00.jpg)
![Imagen](http://www.galeoptix.nl/fila/argentina/thumbs/arg_1939_5c_livestock_symm_ortho_mi_02.jpg)
This last version has got the same line of AЯ as the one with parallel paper!
Re-posted as there is no way for me to comment the article in Revista 225 by J.R. Merlo on this subject....
rc2089