Italian designation for the fuzes known as "I" and "I.1" by the British

[Temistocle]

In the 1948 document "ITALIAN BOMBS & FUZES" By Col. A.D. Merriman, the fuzes have a "British" designation.
I would like to know which are the Italian designations of the fuzes known by the British as "I" (175 mm long) and "I.1" (190 mm long), shown below.

 

[Busta]

Merriman leaves the "Italian Designation" field blank for both (pp. 233 and 241), so the name isn't in his report. He does tie them down, though: Fuze I (175 mm, detonator only) is for the Bomba 3 cV, and Fuze I.1 is for the Bomba 20 cV, with the fall figure stamped on the plate (specimen "m.450") and a base plug threaded for a gaine adaptor. His bomb sheets give the old Italian names as "Bomba da Kg 3 c.a." and "Bomba da Kg 20 c.a." (cV = contro Velivoli). For Fuze K he records "Spoletta per Bomba da Kg 2", which suggests these were simply "spoletta per bomba da kg 3 / 20 c.a.". Has anyone seen a Regia Aeronautica document or a fuze marking that confirms it?