Proof coins are those coins which are very unique from the uncirculated or uncirculated coins in many ways. Proof coins are manufactured under a strict quality norm and under the supervision of the experts.
While minting these coins stringent norms of quality are practiced at every stage.
The uncirculated coins are not of best quality as proof coins. It has no design frosting but ground is mirror polished. The uncirculated coins do not bear Mint Mark (M) like proof coins.
Metal blanks are carefully selected for the proof coins (rejection rate is 70% to 75%). Those with scratches and other imperfection are cleared carefully to remove all the blemishes.
The dies for making proof coins also receive a special polish treatment called ‘Blasting’ resulting in a mirror like surface. Unlike ordinary coins produced by mechanical pressure at the rate of few hundred every minute, Proof coins are struck individually by hydraulic presses. Small details and delicate lines in the picture are brought out in clear cut relief by this method.
The proof coins are carefully handled and are never allowed to come in the contact with other coins, therefore they are struck in a dust free/ proof environment.
Since proof coins are struck and finished individually and require special care in their preparation, these coins are offered by the Mint at a premium price, which is much higher than the actual face value of the coins.
These coins are only issued by the Mint, which produces it. The coins are directly issued to the purchaser by the Mint unlike circulated coins, which are distributed by the Reserve Bank of India. The collectors mostly buy these coins as valued possession for their collections. These coins also have a special alphabetical code minted on these coins stating the Mint of their origin. All these factors make the coins quite exclusive and one of its kind and the coins for connoisseur.
Source of Information:- https://www.facebook.com/groups/RepublicIndiaCoins/doc/246754818743945/
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