What is a mint mark of your 1901? The mint mark is found on the reverse of the coin above the DO in Dollar. If your coin was made in Philly, there are a couple of rare die varieties. They can be worth hundreds to thousands. I have spent a couple thousand on books over the years and made a very nice extra income. If you have coins that are worth say over a couple hundred, then its worth the money to have them Graded. There are a couple of well known 3 party graders. If will help you get the best money for your coin. I use PCGS and at one time had the 4 best Shield Nickel variety collection that was graded.