Lovely piece and typical of Zanetti's larger work. I've got a smaller version with 2 birds of similar dimensions but on a glass plinth and when the light catches them they look stunning so with 7 birds it should be wonderful. Amazing to turn it up in the garage and that it remained undamaged in there. Probably made 1980's or early 90's and one for the future as far as value is concerned as it will surely appreciate, wouldn't like to put a value on it, firstly as this forum is primarily for information and not valuations, but also these larger pieces are very much how much an individual loves the piece and not related to ballpark book estimates.
Paul