The 10c Rivadavia red had to be replaced by the 10c Rivadavia in chestnut-brown in the context of a full scale change of colours due to a change of international postage rates by 20.03.1939!
Tenorio Casal refers to a resolution of the Directorate-General of the Post Office of 27.12.1938 concerning the change of colour of the 10c Rivadavia. The chestnut-brown stamp was due for 16.03.1939. His article is rather confusing in writing about an offset-litho version appearing first followed by the typography version by 04.11.1939...
The type of paper for that stamp has always -
for more than 70 years now - been considered to be a coated paper. Leopoldo Tenorio Casal mentions a coated paper of the 1st production for the 5c Moreno in typography of 05.04.1939.
It seems rather safe to conclude that this 1e production paper was used both for the 5c [05.04.1939] and the 10c [16.03.1939]. Characteristics of the 1st production: 10mm diameter of the suns, inter-solar distances: 29.7x16.8mm.
The 10c chestnut had never been found on un-coated paper so far. The suddenly an alleged stamp on "mate lustroso' was to be found dated in March 1939 [Merlo in Revista 228 ].
The "mate lustroso" for the 5c Moreno dates from 24.03.1940 and has the characteristics: 10mm diameter of the sun, inter-solar distances: 30x17.2mm.
What do we find in Pettigiani now!
The 5c mate lustroso is supposed to have been issued on 10.05.1939 [almost ONE YEAR earlier] and the 10c mate lustroso on 20.03.1939!!
Of course it is very difficult to judge stamps from a distance over the ocean!
But I am afraid that Pettigiani has completely mixed up matters and is confusing a slightly coated 10c chestnut for a mate lustroso. Bear in mind that mate lustroso is not even supposed to be a calandered paper [satinado] and that having a satinado confused with a tizado is an appreciated Argentine philatelic tradition....
Setting the price for an alleged 10c mate lustroso on ONLY 10.00 is absurd for what theoretically still could be a highly rare instance of the uncoated paper for the 10c Rivadavia chestnut in typography.
There is still the Casal scenario! The offset-litho version of 16.03.1939 DOES exist!
to be continued ...