Use the coin's grade to figure out the coins value. This app provides images for each coin and each grade, so you can compare your coin to determine the grade. Photo grading is the same as human grading, you have a mental picture and mental description of a coin grade, then select the image that matches your coin to find the coin grade.
Once you have the potential grade of your coin then you can look up the value of your coin.
Coin value app based on coin's grade.