Pewter is an alloy of tin and a variety of other metals. Pewter tankards are quite common. Pilgrim's badges were often made of cast pewter. Period pewter often contained lead, a toxic metal. Modern pewter is an alloy of tin, copper and antimony and is more properly called Britannia Metal.
Since pewter has a low melting point, it is relatively easy to work with. Moulds can be made in soap stone or cuttlebone.