1918-S Mercury Dime : A Collector’s Guide

By  CoinWeek Notes …..

High Mintage, High Standards, and a Relentless Search for Full Bands

The 1918-S Mercury Dime stands as one of the most instructive issues of the Winged Liberty Head series. On paper, the coin appears abundant. In practice, it challenges even the most advanced collectors. Its story unfolds at the intersection of wartime demand, industrial compromise, and modern grading standards that reward precision over quantity.

Although the issue lacks the headline rarity of the 1916-D or the low-mintage 1921 dimes, the 1918-S has earned a different reputation. Collectors pursue it not for scarcity alone, but for the extreme difficulty of locating sharply struck examples with fully defined reverse bands.

San Francisco Mint Production in 1918

In 1918, the San Francisco Mint struck five denominations. Mint records show that production heavily favored cents and dimes over larger silver and base-metal coins.

San Francisco Mint coinage totals for 1918 were as follows:

• Lincoln Cents: 34,680,000
• Mercury Dimes: 19,300,000
• Standing Liberty Quarters: 11,072,000
• Walking Liberty Half Dollars: 10,282,000
• Buffalo Nickels: 4,882,000

Within this output, the Mercury dime ranked second in total production. Despite this substantial mintage, quality proved far less consistent than quantity.

Die Usage and the Roots of Soft Strikes

United States Mint records reveal that San Francisco employed 73 obverse dies and 66 reverse dies to strike its 19,300,000 Mercury dimes in 1918. This equates to an average of more than 277,000 impressions per die.

The figure reflects both efficiency and compromise. While the coiners demonstrated technical skill by pushing dies to such extremes, prolonged die use resulted in diminished detail. As a result, the typical 1918-S Mercury dime displays softness in the hair above Liberty’s ear and, more critically, in the central bands of the fasces on the reverse.

This production reality explains why Full Band (FB) examples remain elusive, especially in Mint State and Gem grades.

Full Bands: The True Challenge of the Issue

The Mercury dime reverse features a Roman fasces, a symbol of unity and strength, paired with an olive branch representing peace. For a coin to qualify as Full Bands, the horizontal bands binding the fasces must appear fully separated and uninterrupted.

On the 1918-S, this standard proves exceptionally difficult to meet. Overused dies and shallow strikes left most examples with merged or incomplete bands. As a result, fully struck coins form a small and elite subset of the surviving population.

While the issue is not considered a “key date” in the traditional sense, it functions as a conditional rarity. In high grades with Full Bands, the 1918-S becomes one of the most challenging Mercury dimes to acquire.

Wartime Context and Symbolism

The 1918-S Mercury dime emerged during the final year of World War I. The coin’s imagery resonated with the era. Adolph A. Weinman’s obverse portrays Liberty wearing a winged cap, a design often interpreted as symbolizing freedom of thought. The reverse reinforces the theme, combining strength and peace in a single composition.

These symbolic elements were not altered for wartime propaganda purposes. However, their presence adds historical context to a coin struck during a period of global conflict and industrial strain.

The Old San Francisco Mint and Its Legacy

The 1918-S was produced at the Old San Francisco Mint, widely known as “The Granite Lady.” The building famously survived the 1906 earthquake and subsequent fires, becoming a symbol of endurance.

While this survival does not affect the coin’s rarity or grading, it adds a layer of historical association for collectors. Any San Francisco–minted coin from this era carries that legacy by virtue of its origin.

Market History and Noteworthy Sales

Interest in the 1918-S Mercury dime predates modern registry competition. In April 1976, New York coin dealer Joel D. Coen offered choice Brilliant Uncirculated examples for $150 in The Numismatist, a price that reflected early recognition of the issue’s quality challenges.

As grading standards tightened and Full Band attribution gained prominence, the market responded accordingly.

Population data as of March 2025 show extreme selectivity at the top:

• PCGS MS67+FB: 1 example
• NGC MS66FB: 5 examples
• CAC MS67FB: 3 examples, all stickered

Several individual coins have defined the issue’s auction history.

An NGC MS68FB example sold for $22,000 in January 1996 and later realized $35,075 in August 2001. The coin displayed scattered crimson toning and no longer appears in the NGC Census.

A PCGS MS67FB CAC example, certified under multiple holders, sold for $44,850 in 2002, $63,250 in 2009, and ultimately $144,000 as part of The Charles McNutt Collection in January 2019. By that time, the coin showed golden-brown peripheral toning on both sides.

Another PCGS MS67FB specimen from The William Dominick Collection realized $97,750 in August 2010.

More recently, a PCGS MS66FB example from the Del Loy Hansen Collection sold for $21,075 in August 2024.

These results underscore the sharp premium placed on strike quality rather than mintage alone.

Design Adjustments and Circulation Use

When the Mercury dime debuted in 1916, early examples reportedly caused issues in vending machines and pay phones due to thickness. By 1918, the Mint had made subtle adjustments, and the dime functioned effectively in daily commerce. This change does not affect attribution or collectibility but provides context for the coin’s widespread circulation.

Error Coinage: The Mirror Brockage

A dramatic and rare error known as a mirror brockage exists for the 1918-S Mercury dime. In such cases, a previously struck coin became lodged in the press, transferring a reversed, incuse image of the obverse onto the reverse of the next planchet.

While spectacular, these errors remain separate from standard market evaluations and do not define the issue as a whole.

Coin Specifications

• Country: United States of America
• Year: 1918
• Denomination: Dime (10 Cents)
• Mintmark: S (San Francisco)
• Mintage: 19,300,000
• Composition: .900 silver, .100 copper
• Weight: 2.5 grams
• Diameter: 17.9 mm
• Edge: Reeded
• Designer: Adolph A. Weinman (obverse and reverse)
• Strike Type: Business strike

Final Perspective

The 1918-S Mercury dime illustrates a recurring truth in American numismatics. High mintage does not guarantee availability at the highest levels. Instead, production shortcuts, die fatigue, and strike quality define long-term desirability.

For collectors pursuing Full Bands, the 1918-S represents one of the most demanding issues in the series. Its challenge lies not in finding an example, but in finding the right example.