The London Hammer

In 1936 a couple found a rock and with wood sticking out from it. They both took it home and started to open using a hammer and a chisel and found a hammer of unusual manner. When archeologists studied the hammer they came to the conclusion that the hammer was more than 400 million years old. And the shocking thing with the hammer was that it was made with more than 96% pure iron, which is quite a formidable task considering there was no technology like nowadays.