Looks to be a 6 quart, which is the middle one. Actually, I have seen 4 different ones. 8, 6, 4 and a rare 2 quart.http://cgi.ebay.com/VINTAGE-ENTERPRI...3A1%7C294%3A50
Cleaned up, it should work fine. I picked up my parents old 8 quart, which needed some cleaning up of rust, etc. In doing that, I started wondering what the black "paint" was. I asked, but didn't find much help, but kept checking and eventually ran across an old Enterprise ad that suggested it was "japaning", which was a type of paint/finish tool makers used to put on cast and steel tools back when. Some real voodoo went into making that stuff.
Probably not harmful, but you don't need to worry about it. For a 6 quart, you have a perfect size to put your meat into a 2 gallon ziplock freezer bag, then snip off a corner of the bag and pull that out through the spout, put your stuff tube over it and go. Do this right and you have virtually NO cleanup. Sausage won't ever touch the stuffer. And you have NO cleanup.