Benito,
I have never seen a parallel either.
I did some digging though.
The foot curved towards the bow looks like the La Tene I or La Tene A period.
Sure enough the closest parallels I could find come from a book on Etrurian
fibulae. In Pierro Guzzo's "La Fibule in
Etruria" one with the same animal
head on the curved foot are known as La Tene A
fibula type "test d'uccello". Your
Italian is probably much better than mine but I translate that to Bird
head.
The reinforces the first thought that came into my mind - that it is more like a bird
head - specifically duck - than a ram.
They are Guzzo's
type Beta. However, none of
his three sub-types are quite the same as yours.
Interestingly he dates them to 5th-4th c BC.
Do you know where it is from?
Etrurian/North
Italic fibulae types were widely copied in
Illyria and the Dalmatian Coast and sometimes appear in the inner Balkans too.
Shawn