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Error Coins

Errors found in common coins are result of mistruck during the minting process in the mint.

Error coins can be the result of deterioration of the minting equipment, accidents or malfunctions during the minting process, or intentional interventions by mint personnel.

Errors can be broadly classified as per their striking. Few errors are pictorially described bellow.

Broadstrike :

brodestruck

 

A standard type of strike error is a broadstrike, where the rim image is not struck into the coin’s edge because the collar die was missing.

Brockage :

brockage

A brockage or Lakhi is when a mirror image of a coin is struck on both sides of the planchet. This error typically occurs when a coin remains on either die after striking. The second coin receives the image from the die, though its blank other side also receives the image of the struck coin, and the result is an incuse mirror image.

Clipped Planchets :

cut error

Sometimes planchets are produced incorrectly if one sheet of blanks overlays a previously punched-out portion of blanks. The resulting planchet will be irregular in shape, or actually lack metal in some area of the finished coin.

Die Break :

die crack1

Similar to die crack error coins, die breaks will affect a larger portion of the coin. The results occur when a large piece of the die breaks off, leaving a raised area on the struck coin.

Multiple strike :

2 rupees double struck

multiple_coin

This occurs when the coin has an additional image on one side from being struck again, off center. The result is sometimes mistaken as being a doubled die or triple struck.

Off Center :

offcenterstruck

Off-center strikes are a common error in the minting process. The planchet is hit in the wrong place by the upper die, causing part of the design to be missing. Struck on wrong planchet :Sometimes mistakenly classified a planchet error, a coin that is struck on an incorrect planchet occurs when the wrong planchets, are fed into a coin-stamping press. This results in a coin that has been stamped with a design intended for a differently sized coin. In addition, unminted or blank planchets are occasionally produced. A wrong planchet occurs when a denomination is struck on a planchet of a different denomination.Some examples include 2 rupees coin struck on Rupee, planchets, or Rupee on 50 paise planchets.

Struck on wrong planchet :

rupee in 50paise

Sometimes mistakenly classified a planchet error, a coin that is struck on an incorrect planchet occurs when the wrong planchets, are fed into a coin-stamping press. This results in a coin that has been stamped with a design intended for a differently sized coin.

Struck on wrong planchet (2 Rupees in Rupee Planchet and Rupee in 50 Paise)

Rotated Die :

rotated

Typically, the obverse and reverse sides of a coin remain upright when vertically rotated (alignment at 180 degrees). If the dies are not properly aligned at 180 degrees, it is considered rotated.

Rotated Die (180 degrees)