Found this at an estate sale, with a bunch of other random stuff. I'm thinking it's some sort of kitchen tool, maybe a meat mallet. My wife thinks you fill the back with ice to cool it, then use it on dough. It weighs 1.28 pounds and is 8 inches long, with a 5 inch handle. I haven't cleaned it yet, but I'm thinking about taking it down to brass and putting a good polish on it. Of course I'll wait to figure out what it is first, I don't want to alter a potentially valuable item.