(Not silver so this is not a valid entry)
http://forums.silverstackers.com/uploads/90_img_0880.jpg
This is 'Dead Eye Liz' and a very rare Hole-Tailed Platypus.
I have a dozen or so of these from when I was working in currency handling. They're known as "fish hooks" and are used by naughty people to go "fishing" in vending machines by stringing fishing line or fine wire through the hole and pulling the coin out after it registers in the mechanism.
Modern coin mechs have protections against "fishing" now so you don't find many new coins with these holes in them, but I have to admire the dedication and time these cheapskates put in attempting to get 20c off a can of Coke.