- 1). Set the coin with the head side facing up. Place the magnifying glass stand directly over the coin so you can easily see the details.
- 2). Look closely at the overall look of the printed image. If the edges clearly appear doubled, then you have a double-die coin.
- 3). Inspect the numbers of the date for smudges or over-thickness in the lines. If some of the numbers appear blotchier than others, you are seeing polishing errors, not a double-die image.
- 4). Check the small uppercase letter directly below the date. Look carefully for a second letter below the first, as this is an easy-to-spot indicator of a double-die.
- 5). Look at the serifs for small horizontal splits or breaks, which will give away the presence of a first die below the top one. Serifs are the small flourishes on the corners of the letters.
- 6). Follow the edges of the letters and designs for inconsistencies compared to similar coins. If the differences are found commonly throughout the coin, it is very likely a double-die.
- 7). Check the insides of letters such as D's and O's. If there are dips or bumps inside the letters where the coin should be smooth and flat, this is probably a sign of being printed twice.
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