The tradition of putting a silver coin in the Christmas pudding may have originted in Roman times when charms were hidden in food during Saturnailia, when the god Saturn was celebrated as the god of agriculture.In Britain, silver threepences or silver sixpenses were added to the pudding on the last Sunday before Advent, when it was traditional for the whole family to take turns in stirring in the ingredients.
Once the pudding was served on Christmas Day, the finder of the sixpence could keep the coin, which was deemed to be a symbol of wealth for the coming year.
Other tokens used have been a tiny wishbone, to bestow good luck, a silver thimble for thrift or an anchor to symbolise safe harbour.
http://www.acsilver.co.uk/shop/pc/viewPrd.asp?idcategory=54&idproduct=423

