Union Shield Cents Guide
The Union Shield Cents serve as the fifth and final chapter in the story of the Lincoln penny’s redesign. Debuting in 2010, the Union Shield reverse replaced the four-piece Bicentennial series of 2009 and the long-running Memorial reverse that had been a staple since 1959. This design was specifically chosen to represent Lincoln’s successful preservation of the Union during the American Civil War. For the modern numismatist, the Union Shield era is far from “common change”—it is a fertile ground for discovering new varieties and significant historical anomalies.
The Symbolism of the Union Shield
The reverse of the Union Shield Cents was designed by Lyndall Bass and sculpted by Joseph Menna. It features a Union Shield with 13 vertical stripes, representing the original 13 states, joined together by a single horizontal bar at the top that represents the federal government. Across the bar is the motto E PLURIBUS UNUM (“Out of many, one”). A scroll draped across the shield bears the denomination “ONE CENT.”
This imagery predates the Civil War, dating back to the late 1700s, but it became a potent symbol of national unity during the 1860s. The obverse continues to feature Victor David Brenner’s 1909 portrait of Lincoln, though in 2010, the Mint utilized a refined master die that restored some of the original sharp details of the 1909 strike that had been lost through decades of hubbing.
The Historical 2017-P “Philadelphia” Mint Mark
Perhaps the most significant event in the Union Shield Cents series occurred in 2017. To commemorate the 225th anniversary of the United States Mint’s founding in Philadelphia, the Mint did something it had never done in over two centuries: it added a “P” mint mark to the cents struck at the Philadelphia facility.
Historically, Philadelphia coins bore no mint mark. This 2017-P Lincoln Cent was a one-year-only commemorative gesture that caught the numismatic community by surprise. While billions were minted, making them easy to find in circulation, they remain a “must-have” for any Lincoln Cent enthusiast as the only year in history where a Philadelphia penny carries the “P” mark. Starting in 2018, the Mint reverted to the tradition of no mint marks for Philadelphia cents.
West Point “W” Mint Mark Cents
In 2019, the Mint created another landmark rarity for the Union Shield Cents series. As a special premium for collectors who purchased official Mint sets, the West Point Mint struck cents with a “W” mint mark. These were never released into general circulation and were packaged separately within the sets.
- 2019-W Uncirculated: Included with the standard Uncirculated Coin Set.
- 2019-W Proof: Included with the standard Proof Set.
- 2019-W Reverse Proof: Included with the Silver Proof Set.
These “W” mint mark pennies are highly sought after, and because they are susceptible to “spotting” or “zinc rot” if not stored correctly, high-grade specimens in PR69 or MS69 condition carry a substantial premium over their initial issue price.
Modern Doubled Dies and Striking Errors
Because the Union Shield Cents are produced in such staggering quantities (often exceeding 4 billion per year), the manufacturing process occasionally results in fascinating errors. Modern “Single Squeeze” hubbing technology has made the dramatic doubled dies of the 1950s rarer, but “Class IX” doubling still occurs frequently.
| Year | Known Variety/Error | What to Look For |
|---|---|---|
| 2010 | DDO (Doubled Die Obverse) | Strong doubling on the date and the word “LIBERTY.” |
| 2011 | DDO | Look for thickness and “notching” on the digits of the date. |
| 2014 | Double Ear | A small “lobe” appears below Lincoln’s ear, similar to the famous 1984 error. |
| 2017-P | Struck-Through Error | Grease or debris in the die causes missing details in the shield or Lincoln’s hair. |
| Various | Die Cracks / “Cuds” | Look for raised lines of metal on the reverse, often near the rim. |
Metallurgical Challenges: Zinc Rot and Plating
Like the Memorial cents before them, Union Shield Cents are struck on copper-plated zinc planchets. This composition presents a unique challenge for long-term preservation. If the thin copper plating is scratched or breached, the inner zinc core begins to oxidize. This leads to “zinc rot,” characterized by white, powdery spots or dark, bubbling blisters on the surface of the coin.
When collecting these for a high-grade set, “Full Red” (RD) luster is the only acceptable color. Collectors should look for coins with “satin” or “mirror-like” surfaces that are free of the tiny carbon spots that frequently plague modern zinc cents. Because of the high volume of production, “bag marks” (scratches from coins hitting each other in Mint bags) are common, making an MS-68 or MS-69 specimen a true condition rarity.
The Future of the Shield Cent
As we move toward the United States Semiquincentennial in 2026, there is significant speculation regarding the future of the Union Shield Cents. Legislation has authorized a change in designs for the 250th anniversary of the nation, which may mean the Union Shield design will reach its conclusion or be temporarily suspended for commemorative themes. Regardless of future design changes, the Shield Cent remains the face of 21st-century American commerce, documenting the modern Mint’s technological journey and its ongoing tribute to the nation’s 16th President.