The asymmetrical paper wire plus parallel watermark that had been used in coated paper in the period 1947-1961 belongs to all imported paper from Wiggins Teape (Alex Pirie Mills). It was assumed that this type of paper was only the coated version of the same asymmetrical wire with parallel watermark paper that had been in use since 1943 [Earthquake]!
This assumption is probably just too easy!
Studying the 1952 Evita Peron definitives we have both at hand! The uncoated version for the lower values [except the recess printed 45c!] and the coated version for the higher values [1p upwards]. All printed in photogravure but for the 5p, 10p, 20p and 50p that are in recess.
Looking through a magnifying glass at the back of the coated paper stamp, the surface is rather smooth, fluffy but NO grooves ; the fibers are rather felted and quite often the contours of the watermark can be seen in relief! That is, they are a bit below the surface!!! It seems that the back of the stamp is the felt side of the paper [the side that was in touch with the dandy-roll]!!
The front of these stamps can vary a bit - they usually have a fluffy surface, hardly any groove to be seen but occasionally the coating seems a bit thicker with a very smooth surface [no fluffiness] but then often with clusters of minute holes [pin holes]. I referred to this phenomenon as Tizado Varioloso [pockmarked coating] that was so frequently observed in the 1966-1967 period for the Zárate paper that had been coated elsewhere. The pockmarks are supposed to have been caused by overheating the coating substance. This same phenomenon can be observed - to a much lesser extent as to the size of the holes - in the very first period of Argentine coated papers [1939-1943]....
When observing the unprinted sheet margins no relief of the watermark is visible! Apart from the coating I assume that the application of varnish is mainly responsible for the gloss at he front of the stamp. Not the coating itself!
The Evita stamps on coated paper normally have the fluffy front surface, rarely we meet stamps that have a thicker layer of coating!
1947 12.10 400 year Cervantes in photogravure [part of the printing has an orthogonal wmk]
1947 24.12 Youth Crusade for World Peace 20c in photogravure
1948 21.05 Day of the Indians in photogravure
1948 16.07 5th Anniversary of 4 June Revolution in photogravure
1948 22.07 Traffic Safety in offset-litho
1949 04.06 Constitution in recess Giori
1949 19.11 75 year UPU in recess Giori
The uncoated papers have a very clear visible watermark at the back of the stamp, but hardly a relief as the vision is spoiled by the grooves of missing fibers....
In 1950 TI3 gets succeeded - or was it in use at the same time? - by TI4 the coated "Tela".
The 1950 17.08 100 year death of José de San Martin stamps printed in recess on the Giori press have this type of paper! It seems that only a few recess stamps have TI4 [a.o. the 50c Puerto de Buenos Aires] plus the 5c JSM in typography and 10c Rivadavia in typogprahy type IV?
Later imported coated papers with a parallel watermark [all Wiggins Teape!] are hard to split up into the different wires! Tela is just a symmetrical wire with a coarse density 24/22 whereas the "normal" one has an asymmetrical wire with density 30/20! So they are not different watermarks but different paper wires!!!
to be continued ...
Rayado Vertical = Asymmetrical wire, parallel watermark
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