1. World's most expensive coin: 1794 silver dollar
On the edge: Has the words “HUNDERED CENTS ONE DOLLAR OR UNIT” inscribed with decorations separating the words.
2. The King of Coins-King of Siam 1804 silver dollars minted in 1834
3. World's largest gold coin; Perth Mint 1 tonne gold Kangaroo coin.
The coin reverse shows a bounding red kangaroo surrounded by stylised rays of sunlight and bordered by the inscription AUSTRALIAN KANGAROO 1 TONNE 9999 GOLD and the year-date 2012. The coin obverse of the coin features the Ian Rank-Broadley effigy of Her Majesty Queen Elizabeth II, accompanied by the inscriptions ELIZABETH II, AUSTRALIA and the monetary denomination of 1 MILLION DOLLARS.
4. Mona Lisa of Rare Coins: 1913 Liberty Head nickel
5. World's most expensive penny -1943D Lincoln cent
6. Worlds most expensive gold dinar-The Umayyad dinar
A specialist auctioneers, Morton & Eden in London, make it in a record book for Worlds most expensive gold dinar and Dirham. The Umayyad dinar, one of the rarest and most highly-prized of all Islamic gold coins, struck possibly to coincide with an occasion when the Caliph himself led the Hajj pilgrimage to Mecca, sold for a record £3,720,000 in a sale at specialist auctioneers Morton & Eden in London. The Umayyad dinar, dated 105h (723AD) was struck from gold mined at a location owned by the Caliph himself; known on the coins as the “Mine of the Commander of the Faithful”. An additional legend which reads: “bi’l-Hijaz” (“in the Hejaz”), makes it the earliest Islamic coin to mention a location in the Kingdom of Saudi Arabia.