The 1998-S Lincoln cent is normally a standard proof coin struck for collectors.
The San Francisco Mint made these modern pennies with specially prepared dies and polished planchets.
Most 1998 proof cents used a reverse design intended specifically for proof strikes.
However, a few dies received the business strike reverse hub by mistake.
This mix-up created the famous 1998-S Close AM variety, officially cataloged as FS-901.
It stands out in the Lincoln Cent series because proof coins were meant to have a Wide AM design that year.
Finding a circulation-style reverse on a carefully struck proof coin is an unusual error for modern United States coinage.
Collectors actively hunt for this distinct transitional variety in proof sets.
A top-tier example of this variety crossed the auction block through Heritage Auctions (HA).
The coin was certified in a perfect grade 70 holder.
A grade 70 means the coin is completely flawless under five times magnification.
It shows no post-production marks, scratches, or handling defects of any kind.
The sale realized a notable price during the 02/24 auction event.
Flawless modern varieties often spark intense bidding wars among registry set builders.
When a rare variety pairs with a perfect numerical grade, collectors are willing to pay top dollar.
It is important to remember that record prices belong only to top-graded certified pieces.
A raw or lower-graded coin will not bring the same amount as a pristine grade 70 specimen.
The primary driver behind this coin's value is the accidental pairing of mismatched dies.
During the late 1990s, the Mint used two different hub styles for the reverse of the Lincoln cent.
Proof coins were supposed to have wide spacing between the letters A and M in AMERICA.
Business strikes intended for circulation were supposed to have those letters touching.
Only a very small number of proof dies were mistakenly prepared with the Close AM design in 1998.
This makes the 1998-S Close AM a genuine variety rarity rather than a common strike anomaly.
Proof collector demand is strong because many people try to assemble complete sets of every modern variety.
Condition rarity also plays a massive role in the final market price.
While many proof coins survive in high grades, achieving a perfect 70 is exceptionally difficult for any coin variety.
You can check your own 1998-S proof penny with a little bit of magnification.
Grab a 10x jeweler's loupe or a clean magnifying glass to get a sharp view.
Turn the coin over to the reverse side and look directly at the word AMERICA.
Focus on the bottom right leg of the letter A and the bottom left leg of the letter M.
On the rare Close AM variety, the bases of the A and the M practically touch each other.
On the normal proof coin, there is a clear, wide gap between the two letters.
You can also examine the designer initials FG near the Memorial building.
On the Close AM variety, the initials sit noticeably farther away from the base of the Lincoln Memorial.
If you are not sure what you have, a mobile tool like Coin Value Checker can help you do a quick first pass.
Be careful not to confuse this proof coin with regular 1998 pennies made in Philadelphia or Denver without the S mint mark.
Take your time inspecting the lettering carefully under good lighting to confirm the spacing.
For a second opinion in seconds, take a look at our roundup of the best coin valuation app options.