I took the mercury head dimes and the barber dimes to the coin shop. The guy looked at them for free and said that the barber ones are only worth $8 because they are pretty worn and he said he thought the 1916-D dime might be a fake. How do you tell? My neighbor had these coin collections since like 1940, and I didn't think he would be the type to make or buy a fake coin! The guy also said if it was real the coin would be worth $200 since it is in good condition.