You can buy books that are coin related errors but you will be spending a small fortune on the books.
My suggestion is to either buy the books on sale or if you could, review it in a book store prior to
buying it. Here some books on coin errors that I have not rated because I have not read it.
-100 Greatest Error Coins
-The Laymans Guide To Error Coins
-The MoneyBucks Handbook: For Minting Errors & Die Varieties
-The Official Price Guide to Mint Errors
-How error coins are made in the U.S. Mints
-The error collector's handbook
-Cherrypicker's Guide to Rare Die Varieties of United States Coins
-Error Coins from A to Z: Alphabetical Listings with Prices
-The modern minting process and U.S. minting errors and varieties
-United States major and minor mint error types
-Longacre's two cent piece die varieties & errors
Error coins generally divided into PDS system which stands for Planchet, Die, and Strike.
What this means is that coin has to qualify in one of these categories to be considered an error.
Planchet simply means a blank surface on what coin is struck on. Die means the stamp which is
used to strike the coin. There are 2 dies, the upper die and the lower die which creates and obverse
and reverse face of the coin. So Keep this in mind, 3 systems:
1. Planchet Errors
All Planchet Errors are errors happening prior to entering press machine. These
errors generally are worth a pretty penny. For example, 1965 Dime and Quarter Silver
Planchet error is a prime example of this kind of error. U.S. Mint created few Dimes
and Quarters minted on Silver Planchets. All 1965 Dimes and Quarters should be minted
on Clad planchet. The easiest way to know if your coin is a Planchet Error is to weigh
2. Die Errors
Die Errors are any errors occurring after being fed into press machine. This is where
you get your variety collection, Double Die Deterioration, Die Blistering, and so on.
Most of the die errors are generally worth less. To be able to distinguish the differences
between Die Errors, you have to have a good eye and keen sense of detection. Some of Die
Errors are very similar with differences in price into hundreds of dollars. One prime
example would be Strike Doubling and Double Die, where both coins almost look the same
but one is worth less and the other a pretty penny.
3. Strike Errors
Strike Errors are errors occurring when the Planchet and the press meet. These errors
usually come into misshaped coins. Best example of this kind of error is off centered
coins with half of the coin blank and the other half image of the coin. These errors are
moderate in price and collecting these coins are fairly easy.
Although error coins would sell much more than their face value, they are not what you would want
for an investment. They are fun to detect and collect but not to investment. The reason for this
is the demand for error coins are lot less than regular coins. Keep in mind; if you are an expert
in collecting error coins, you are a Numismatist. Not only an error coin expert has to identify
the coin to be an error but also be able to grade the coin. These two simple factors not only makes
the error coin expert the best expert in the business but also gives him or her a unique ability
which is not present in regular coin experts. I collect errors because U.S. Mint does an outstanding
job catching these errors before it hits the circulation. I have not been able to detect a Double Die
yet, and I have searched through more than 50,000 coins in different denominations. So, with that
said, think how lucky you would be if you can spot one of these beauties in a roll.