A coin is a piece of hard material, traditionally metal (especially silver or gold) and usually in the shape of a disc, which is used as a form of money. In the SCA, they are often made in pewter to resemble silver. Coins are produced by moneyers. Beyond mercantile uses, coins are sometimes fashioned into jewelry or used in favours.
- http://en.wikipedia.org/wiki/History_of_Coins This page could use some help
- http://en2.wikipedia.org/wiki/English/British_coin_Penny But this page has some amazing depth