Types of paper and their first use [according to Pettigiani] and their relative scarceness:
TI 2 1942 normal "c" for both; This should be closer to 1945!
TI 3 1950 ascending "c' for both; descending "R" for both
TI 4 1949 ascending "c' for both; descending "R" for both
TI 5 1950 normal "R" for both; inverted "c" for both
Pettigiani mentions the design sizes: 26.8x20.3mm for the first printings [TI 1 and TI 2 partly] and 26.3x19.8mm for all later ones. My impression is that the 26.8x20.3mm goes with the types II/II and that type IV goes with the 26.3x19.8mm.
Somewhere in between June 1943 and 1947 when Tenorio Casal wrote his article a new cylinder for the 10c Rivadavia chestnut-brown in typography must have been made. We will find type IV from 1945 onwards! I would appreciated good scans of earlier than 1946 cancellations.
As important as the name tablet had been for distinguishing type I and II, the same goes for the new cylinder. They can be recognized by the different outlook of the left hand part of the name tablet:
The differences in sizes Pettigiani refers to coincide with my own observations. The size of the 10c had changed constantly. This time the width has come down to 19.5 [the first 10c red was 21.0mm wide!]. A quick measuring of the word "Bernardino" will result in 5.8 [originally 6.2mm!] will help.
The more characteristic feature is the "L" shaped appendix:
