This was listed as a Khmer coin from Cambodia, ca. 1000 AD. I have no way of independently verifying this, but it certainly looks very old to me. Of course my main interest in it is not that it's old, but that it's an example, my only so far, of a coin made of lead.
Source: eBay seller trader55553
Contributor: Theodore Gray
Acquired: 28 August, 2004
Sample Group: Coins