Hi eftihis,
Great acquisition, that one, and, right: probably Venetian or, in general, North Italian or Austria. Many thanks for sharing! P.S. Why shouldn't it be of Greek origin?
Mark, I think your first guess in dating was quite correct: 17th to 18th century.
No hints or contemporary sources on hand grenades seem to exist before the 16th century but I'll try and re-check that.
For anybody interested in similar early grenades, please see my following thread
http://www.vikingsword.com/vb/showth...=hand+grenades
Best,
Michael