The price of coins is available through coin-collecting organizations, coin appraisers, auction houses and coin dealers. Organizations that provide general information on the value of collectible coins include the Professional Coin Grading Service, the Official Red Book, the NumisMedia Fair Market Value Monthly Price Guide, CoinTrackers and Coinstudy.
The intrinsic value of a coin's raw materials is available from raw metal evaluators, such as Coinflation and USA Gold. When determining the value of a coin, price guides look at the coin's year, place of minting, set, striking errors, condition and the total number actually produced. In general, older coins carry a higher value than newer coins. Coins from smaller mint facilities, such as Carson City and New Orleans, are worth more than those minted at the larger facilities in Philadelphia, San Francisco and Denver. The condition of a coin is rated on a general scale of poor, fair, almost good, good, very good, fine, very fine, extremely fine, almost uncirculated, uncirculated and brilliant uncirculated. Errors that increase the value of a coin include off center strikes, clipped planchets, cracks, cuds, blank planchets, lamination errors, unplated coins and broadstrikes. Coins minted as proofs also carry increased value. Rarity is a central factor in determining the value of a coin.