The first issued (1906) engraved by Savage, was printed in a private Company (
Officina Calcografica Italiana-Roma) because the Government (
Officina Carte Valori Torino) did not have equipment for intaglio/recess printing yet.
When the first printing sold out was printed the second (1909) in typography by the
Officina Carte Valori Torino (Government).
In 1911 (last issue) the Government already had presses to print in intaglio/recess.
These are the 3 types :

Type I - 20 March 1906 - Scott 93 (SG 74)
Type II- 1 June 1909 - Scott 111 (SG 80)
Type III- October 1911 - Scott 123 (SG 90)
I don't know which are the 3 types
of crowns on the stamp engraved by Robert Savage.
I see 3 different crowns but on the 3 different
stamps showed above.
Bonus...
This is a Die Pro
of of a rejected design for this issue.
It was also engraved by Robert Savage :
