The die below is over two thousand years old. It was made and used for playing by Celts living in today's southern Poland (Silesia) - in the second century BC.
The die seems to be relatively "new" in the sense of being unused for playing. There are few signs of wear and tear. As is visible in the pictures, it has a different construction than the cubic dice familiar to us today.
Archaeologists are not sure what game or games it was to be used in. It is possible it was intended for some kind of early board game, with the board perhaps made of organic material which very rarely survives until today.
Sources: National Geographic Poland, Twitter, Museum of Silesia