What is the NGC US coin price guide?
Could you possibly explain what the NGC US coin price guide actually is? Is it a comprehensive resource that provides accurate valuations for US coins graded by the Numismatic Guaranty Corporation? Or does it offer more than just pricing information? I'm particularly interested in knowing if it covers a wide range of coins, including rare and collectible ones, and if it takes into account factors like condition and rarity that affect a coin's value. Also, is the price guide updated regularly to reflect market changes? And finally, how does it compare to other coin pricing guides in terms of accuracy and reliability?