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Oxidization and general 'wear & tear'. Coins contain copper - which reacts with the air, making the coin dull. Additionally, grease and dirt from people handling the coins contributes to their dull appearance. Newly-minted coins are bright & shiny.

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Q: What makes the coin dull?
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All travelling becomes dull in exact proportion to its rapidity?

The traveler decides when traveling becomes dull. If the traveler keeps their spirits and their sense of adventure up, there is not guarantee that the journey will ever become dull.


How much is a 1944 wheat penny with a 2 stamped on Mr.Lincoln jacket?

The "2" was added by someone who used a metal punch after the coin was in circulation. That makes it a damaged coin worth face value only.


Will your 1964 silver quarter be worth more as the years go on?

Answer So you have a Silver Quater and want to know if it will be worth anything as time goes by. Time has nothing to do with the value of coins. What makes them valuable is how many of that particular coin was minted that year. It's the amount of coins in circulation that makes a coin worth anything and of course the condition of the coin. If it's scratched it could be hundreds of years old, but not many collectors will want it scratched and even if they do, you won't get the full price of the coin unless it's in perfect condition. The best way to see if your coin is worth anything is to take it to a place that sells coins and see what they say regarding your coin.


How do you know if a coin is frosted proof or mirror proof?

A frosted proof coins were issued by the US Mint prior to 1936. In appearance they have a mirrorlike field [[the field of a coin is the flat areas not covered by the design]]with the design of the coin appearing to be frosted or dull in comparison to the field. This type of proof was again used on proof coins in the late 1970s and are refered to as "cameo" proofs. A mirror proof [[also called a Brilliant Proof]] has a mirrorlike surface over the entire coin. This type of proof was issued by the Mint from 1936 until sometime in the late 1970s.


How do you tell if 1936 penny is a proof penny?

8-15-11>>> The first thing is the coin can't have a mintmark. Proofs were only struck in Philadelphia at this time and were NOT relased for circulation, less than 6,000 were struck. I don't know what makes you think the coin is proof, but the best thing to do is take it to a coin dealer.