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The coin collector should need to know where to find coins, how to determine their value and how to store them properly. The coin collection is easy with the proper knowledge and resources. Every coin has two sides OBVERSE and REVERSE. Obverse is referred as head. It is the main side of a coin that carrying the portrait head of the ruler or a symbol and name of the country. The reverse is denoted as the back side of the coin and is called the tail. It describes the price of the coin with year and mint mark. Mint-made error coins are the coins with errors made during the minting process. They are the results of accidents or malfunctions during the minting process. Error coins have problems such as being struck-off center, or with great thickness or too thin. Coins are made with some raised line on its surface. This is due to cracks in the die.
Error coins have been continued to be in the spotlight. The first error coins that cross the million-dollar threshold are minted in September 2010. The most common errors are discoloration of the face, chipping of the surface, broken edges, double striking, mis-stuck coins, etc. Error coins are produced on a large scale accidentally.
The mints find out these coins and put them back to melting. But some of them are escape. These defective coins are eagerly gathered by the coin collectors.
- Some specimens of coins are found with normal design on one side and the same design on another side also. They are called as Lakhi coins.
- Die rotation is a type of minting error on the coin in which the obverse and reverse die is rotated. Accidental error coins are more valuable to the numismatists. In modern minting system, error coins are usually very rare.