Actually in province of Como
TYPES OF CANCELLATIONS and PERIOD OF USESI Ig - inclined block letters
with initial capital letterOf prephilatelic origin, from august 1840 to december 1851 C3 - triple circle From january 1852 to december 1860
USE OF THE CANCELLATIONSCancellation Prephilatelic 1st issue 2nd issue 4th Sardinia Revenue SI Ig - inclined block letters
with initial capital letterX X - - - C3 - triple circle - X X X -
VALUTATION OF THE CANCELLATIONS (**)Cancellation Prephilatelic 1st issue 2nd issue 4th Sardinia Revenue SI Ig - inclined block letters
with initial capital letter4 - 5 13 - 13 - - - C3 - triple circle - 5 - 5 10 - 10 8 - 9 - (**) The evaluation is expressed using a double system: in white color you can find the score indicated in the Sassone catalogue and in green color the one that the experience of the collectors consider coherent with the availability on the market. I want to underline that the alternative valutation DOESN'T want to replace the one from the catalogue but it only wants to give you a personal esteem, coming from decades of specialized collecting and costant research of this kind of cancellations.
The score system used there is the same of the one present in the Sassone catalogue (from 0 to 13 and from R1 to R5).
C3 cancellation on 15 centesimi, 1st issue C3 cancellation on 5 soldi,
2nd issue, 1st subtype
C3 cancellation on 20 centes, 4th issue of Sardinia