In Micronesia on the island of Yap, the Rai stone is legal tender and heavy at that. The coins are rather large circular limestones with a hole in the center. At between five and 20 feet in diameter, these numismatic colossi derive their value not from monetary or fiscal policy, but rather from their size, weight and effort to transport. In parts of West Africa up until the 20th century, twisted iron barbs with a spatula at one end and a T at the other were used to transact business, though they look more like a steel leader on a fishing line. Known as Kissi money, broken pieces of it were deemed worthless unless restored in ceremonial fashion by a witchdoctor, in a case of currency rebasement. The Canadian $1 million coin weighs approximately 220 pounds, most of which is comprised of gold bullion, and sells for roughly twice its face value due to the high value of its content. Don't plan on paying for sundry items with this. You'll empty the vendor's till and everything in the bank. The ancient south Indian Vijayanagara Empire lays claim to the smallest coin in numismatic history. The Quarter silver Tara weighs .06 ounces and measures four millimeters in diameter.
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