Hooray! It's time for our collaboration with What is it? blog. If you can guess what today's strange object is, you'll win a Free Neatorama T-shirt (old design).
Place your guess in the comment. One guess per comment, please, but you can submit as many as you can think of. Post no URL - let others play, please. First one to guess right will win the T-shirt. If no one guessed right, then the funniest guess will get it instead.
For more clues, check out What is it? Blog.Update 2/29/08 - the answer is:
A battery date marker, some old batteries had a lead bar on the top into which the date was stamped with this piece. The numbers on it represent the 12 months of 1956, and the first three months of 1957.
I suppose "stamp tool" is right, so Marcin Petruszka #3 got that right first. But since no one specifically said "stamp tool for battery" I've decided I'll give TWO winning shirts. One to Marcin, and another one to Louise #25 for the funniest entry (Iron Man's wedding ring) - congrats, guys!