I found this very neat picture of a snakes and ladders made for the civilian population by the UNPA (Unione Nazionale Protezione Antiaerea, national air-raid protection union). The reason I post this in this wiki is that there are multiple gas mask images inside it rapresenting rare gas masks, some of which I can't recognize!
Now I'll list the masks drawn on this game
N. 8 : S.I.P. 1
N. 15 : V.V.F. pattern S.I.P.
N. 21: P45
N. 43: S.I.P. 3
N. 49: S.I.P. 2
N. 55: Undefined, probably a S.I.P. variant
N. 63: Pr.C.33
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