The three most valuable foreign coins, according to ValuableWorldCoins.com, are the rare Edward III 6 shilling coin, sold for $6.8 million in 2006; the Islamic Umayyad dinar, sold for $6 million in 2011; and the Canadian Queen Elizabeth II coin, sold for $4 million in 2010. The value of a collectible coin depends on factors such as demand, scarcity and condition, which determine its sales price at any given moment.
The Edward III 6 shilling coin was minted in the mid-1300s but was discontinued after a year of production. The coin that sold for $6.8 million is one of only three in existence, making it one of the rarest coins in the world.
The Islamic Umayyad dinar was minted in 724 A.D. in Saudi Arabia but never circulated. Because the coin has always been part of a collection, its condition is pristine, as of 214. Historians estimate the coin was minted under one of the earliest forms of government established in Saudi Arabia.
The Canadian Queen Elizabeth II coin is made of 99.99 percent pure gold and has a face value of $1 million, which is far less than the value of its material. This enormous coin weighs 220 pounds and measures almost 21 inches in diameter.