Coin grading is one of the most important things a collector must learn before going very far into the hobby. Coin grading is not only valuable to find the condition of your coins but also to make sure you’re buying or selling coins at a fair price based on their condition. Professional coin grading services, such as PCGS, NGC, and ANACS, have trained professionals to determine the grade, and thus, the value of your rare coin(s). Some coins are easy to grade, while others are much more difficult, for one reason or another. Often this involves the design of the coin, which may be unique to a specific series. This can also make determining if a coin is genuine difficult. These are some of the most difficult coins to grade, even for professionals who have been in the profession for many years.