The most valuable American coin in current production is the half dollar. This half dollar is worth 50 cents when used.
The rarest and most valuable Lincoln cent that isn't an error is the 1909-S with VDB on it. The rarest and most valuable error Lincoln cent is the 1943 copper penny.
The 1942 Lincoln cent is a very common coin. Most are only 3 to 10 cents.
1856 3 cent coin value
The Bahama currency has a 15 cent coin. Its square with rounded corners.
it has no value and is by far the most rare
After the abolition of the Guilder, the new most valuable coin would be the 2 Euro coin
Although the Australian 2 cent coin was withdrawn from circulation in 1994, they are still legal tender and are worth 2 cents. There are two Australian 2 cent coins that are considered to be valuable, the 1967 and 1968 coins, both minted at the Perth Mint. What makes them valuable is the missing designers initials (SD) below the lizard and to the left of the front right claw.
The most valuable and desireable Lincoln cent is the 1909 S VDB coin. If you have a 1909 S minted cent, flip the coin over to the reverse side and look at the bottom between the wheat ears. If you see the initials "V.D.B." there in very small print, you have a highly sought after Lincoln cent. A coin in average condition (about VG20) will fetch about $1000 in the current (2011) market. "V.D.B." was the coin designer's initials and stand for "Victor D. Brenner".
These coins are no longer in circulation, but unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth 1 cent. The most valuable Australian general circulation 1 cent coin would be the 1968 coin which, uncirculated and in absolute mint condition might fetch up to $28 AUD. There were 19.93 million minted. A reputable coin dealer will be able to give a more accurate valuation.
The 1943 coin is about $3 at most. The 1951 coin is about $1 at most.
Ram darbar coin
The most valuable coin in the world is the Flowing Hair Dollar. This coin was minted in 1794. This coin last sold in 2013 for just over ten million dollars.
The rarest and most valuable Lincoln cent that isn't an error is the 1909-S with VDB on it. The rarest and most valuable error Lincoln cent is the 1943 copper penny.
The most valuable American coin in current production is the half dollar. This half dollar is worth 50 cents when used.
Mexico's most valuable coin is the 50 pesos gold coin from any year in the 1920's. The gold coin from 1923, 1924, and 1926 is sold for over $2,000 on eBay.
Scarce, but not particularly valuable. There were 200 minted.