Do you,
BAGIRA, at the lower field, in fact, written "Gravetti". And such an artist is, he is mentioned on a couple sites of American galleries, but not the first tier, for example,
http://www.bhnyfineart.com/index.php?section=artists, from which managed to take reproduction. More and reproductions of something not present, the remaining sites old and there is only one mention of the works (2 - 3 times). In fact, he was a nobody: about him, absolutely nothing is known. It is unclear where he was - from Italy or from the United States.
Subjectively, I
does not seem , that the signature on the reduced reproduction similar to the one in your picture. But better would be to compare several samples, which, alas, no.