José,Otin escribió:Rein:
I have just erased a mail I sent to Mr. Barrandegui, Celulosa Zárate´s plant in charge of lab, who never bother to tell me a songle word. Rhe aim of my mail was to be received in Zárate to asl for the existende of symmetrical wire paper at the beginning of the issue. In fact, for me that papel started being used in 1966 with the stamp for polio relief, but years later it was discovered that that paper was already in use 1n 1953 together with the assymetrical paper as demostraters stamps cancelled in that year, which are most scarce.
Concerning the grooves on the front side of the stamp for me it still is an enigma, which I expected to be solved by Mr. Barrandegui, but at no avail. Saludos,
José
the stamps with the grooves at the back show "RA" instead of " AЯ"!!!!


This means that the Zárate watermark is different from all others (i.e. most imported papers!) As it shows the mirrored RA at the felt side!!! And the felt side of the stamps above is at the FRONT!
to be continued ..