Foro de Filatelia Argentina

1921 1st Panamerican Postal Congress in B.A., RA upright:




1917 2c JSM, RA upright:




1917 20c JSM, RA descending:






all are very transparant! What we see as a watermark from the back is in fact he printed watermark!

to be continued ....

The 5c has two directions of paper:





and






to be continued ...

On some stamps you can easily see the print from the back:






















to be continued ...