1955 doubled die penny: how to identify the real thing

The 1955 doubled die obverse is a Philadelphia Lincoln cent (no mint mark) with dramatic doubling on the date, LIBERTY and IN GOD WE TRUST that you can see without a magnifier. Roughly 20,000 to 24,000 reached circulation, so it is scarce but not unobtainable, and it is one of the most copied and altered coins in the Lincoln series.

By the Coin Scanner team · Updated 2026-10-13

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What a doubled die actually is

Coins are struck by dies, and in that era a working die was made by pressing a design "hub" into a blank steel die more than once. If the hub and die were not lined up exactly the same way on each impression, the finished die carried two overlapping copies of the design. Every coin struck from that die then shows the same doubled lettering and numbers. That is a doubled die, also called hub doubling, and because it is built into the die it is a collectible variety.

Machine doubling (also called strike, mechanical or shelf doubling) is different. It happens at the moment of striking, when a loose die shifts or bounces against the coin. NGC describes the result as flat and shelf-like, with no separation between the serifs of the letters, and it varies from one coin to the next. NGC calls it a novelty that does not usually add value. A single coin can even show both kinds.

How the 1955 doubled die happened

In 1955 the Philadelphia Mint was running two 12-hour shifts to ease a cent shortage. According to NGC, a badly doubled obverse die went into a press for the midnight to 8 a.m. shift. By the time anyone noticed, some 20,000 to 24,000 doubled cents had been mixed with millions of normal ones, and the Chief Coiner, Sydney C. Engel, chose to release them rather than melt roughly 10 million cents to find them.

Q. David Bowers later researched the episode with the Mint and put production near 40,000, with about 16,000 caught before release (CoinWeek). Many of the released coins went out as change tucked into cigarette packs sold from vending machines, and PCGS traces much of the early distribution to the Boston area, western Massachusetts and the Binghamton area of New York.

How to check a 1955 penny

1. Confirm there is no mint mark. Look under the date. A D or S rules the coin out. See where to find the mint mark if you are unsure.
2. Look at the whole obverse, not just one spot. On the real variety the doubling is strong across the date, LIBERTY and IN GOD WE TRUST, and the second images are rounded and clearly separated from the first, with split serifs. You do not need magnification to see it.
3. Use a loupe to rule out machine doubling. A 5x to 10x magnifier is enough. Flat, step-like ledges on one side of the letters, without split serifs, point to strike doubling.
4. Check the reverse die marker. NGC notes that higher-grade genuine coins show two thin horizontal lines coming off the left side of the crossbar of the T in CENTS, the mark of the one reverse die used with the doubled obverse.
5. Weigh it. A genuine coin is bronze of about 3.1 g. Weight alone will not prove anything, but a very different reading is a warning sign.
6. Get anything promising certified. NGC and PCGS both grade this variety; buying or selling an uncertified example is risky.

Look-alike fakes and altered coins

Because the variety is famous and valuable, NGC has documented several deceptive pieces:

• Stamped "doubling." One altered 1955 cent had a punch with doubled-looking letters pressed over the original date and LIBERTY. It left dark, sunken areas around the lettering, the original letters were still visible on top, and IN GOD WE TRUST was not doubled at all.
• Struck replicas. Another fake, made to look worn and struck off-center, had mushy detail and a slanted date, and was paired with a reverse showing V.D.B. at the bottom, which genuine cents carry in that spot only in 1909. It had the right weight of 3.1 g but tested as pure copper rather than bronze.
• Machine-doubled 1955 cents. These are real coins, but not the variety. Sellers sometimes describe them as "doubled" in good faith.

What a 1955 doubled die is worth

Grade and color drive the price. NGC reported in 2022 that it had graded more than 3,900 examples with a median grade of AU 58, so most survivors show some wear. Full original red coins are far scarcer than brown ones. Some recorded sales, as reported by CoinWeek:

• A PCGS MS65+RD with CAC approval from the Stewart Blay collection sold for $320,625 at GreatCollections on February 23, 2025.
• A PCGS MS64RD sold for $21,960 at Heritage in January 2026.
• A PCGS MS64RB with CAC approval sold for $14,640 in Stack's Bowers' June 2026 Showcase Auction.

Circulated coins sell for much less than these figures, and condition differences that look small can change the price a lot. For an estimate of your own coin, photograph both sides with Coin Scanner, which reads the date and mint mark and returns an estimated value range. A suspected 1955 doubled die should still go to a professional grading service before you buy, sell or insure it.

Other famous Lincoln doubled dies

The 1955 is the best known, but it is not alone. CoinWeek's survey of major Lincoln cent doubled dies includes these:

The Memorial-reverse varieties (1969-S, 1970-S, 1972, 1983, 1984 and 1995) are covered in detail in our Lincoln Memorial penny errors guide, and earlier wheat cents in the Lincoln wheat penny value guide.

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