The 1918 Standing Liberty quarter series contains some of the most dramatic and collectible error varieties in all of early 20th-century American coinage. From the legendary 1918/7-S overdate to the always-prized Full Head strike designation, each variety below represents a distinct and collectible opportunity. Understanding what makes each one special — and how to spot it — is essential before you sell or buy.
Rarest
$1,700 – $336,000+
1918/7-S Overdate (FS-101)
The 1918/7-S overdate was born from the frantic pace of World War I-era coin production at the San Francisco Mint. A 1917-dated working die was mistakenly hubbed with a 1918 obverse hub, impressing the new date over the old. The result is one of the most dramatic and important overdates in American numismatics, listed as FS-101 by CONECA.
On the coin itself, the curved upper portion and serif of the underlying '7' are visible within the '8' — most clearly at the lower-left arc of that digit. Unlike many overdate varieties that require high-power magnification, the 1918/7-S overdate can often be detected with the naked eye on well-struck examples, making it accessible to new collectors.
PCGS estimates approximately 3,000 survivors exist in all grades, with only around 250 in uncirculated condition and roughly 50 bearing a Full Head designation. Strike weakness is common — this is one of the most poorly struck issues in the entire Standing Liberty series, making Full Head examples extraordinarily rare. The record sale of $336,000 (PCGS MS64+FH, 2020) underscores how commanding gem examples can be.
Most Valuable Designation
$390 – $59,800
Full Head (FH) Strike Designation
The Full Head designation is not a mint error in the traditional sense — it is a strike quality indicator awarded by PCGS and NGC to Standing Liberty quarters that show complete, fully struck detail in Liberty's helmet. Because the head sits at the highest point of the coin's relief, it is the last area to receive adequate metal flow during striking, and the vast majority of 1918 quarters — even mint state examples — show flat or incomplete head detail.
For a Type II Standing Liberty quarter (1917–1930) to earn the FH designation, graders look for three fully distinct leaf sprigs within Liberty's helmet, a complete hairline running along her brow, and a clearly visible ear hole. All three elements must be present; the absence of even one disqualifies the coin. The standard becomes more demanding as the grade increases.
On 1918 Philadelphia quarters, about 40% of mint state survivors are estimated to show Full Head details — making it more attainable than on the 1918-D or 1918-S. The Denver and San Francisco issues are notoriously weakly struck, and FH specimens command especially steep premiums there. A 1918-S MS65FH sold for $6,000 at Heritage Auctions in October 2025, versus roughly $1,650 for the same grade without FH.
Conditional Rarity
$390 – $57,500
1918-D Weak Strike & Conditional Rarity
The 1918-D Standing Liberty quarter, struck at the Denver Mint with a mintage of 7,380,800, represents the lowest production of the three 1918 mints and carries a modest scarcity premium in circulated grades. However, its most significant numismatic attribute is its strike quality: Denver-produced coins from this era are notoriously soft at the center, with flat shield rivets, mushy gown folds, and a weakly defined head.
In mint state grades, the 1918-D becomes a genuine conditional rarity. Well-struck examples with crisp detail at the shield, knee, and — crucially — Liberty's head are uncommon. A Full Head 1918-D in MS65 or better condition is considered a premium coin by Standing Liberty specialists, often selling for multiples of the non-FH equivalent. The 1918-D FH value range tops out around $57,500 for a gem specimen.
Collectors targeting a complete date-and-mintmark Standing Liberty set often find the 1918-D one of the more challenging to acquire in high grade with strong strike. The coin's lower mintage relative to the Philadelphia and San Francisco issues gives Denver examples a small but real edge in the marketplace, and any 1918-D showing above-average strike quality draws keen collector interest.
Best Kept Secret
$100 – $800+
Die Clash Marks
Die clashes on Standing Liberty quarters occur when the obverse and reverse dies strike each other without a planchet between them — a production mishap that leaves a mirror-image impression of each die's design on the opposing face. On affected 1918 quarters, the eagle from the reverse can appear as a ghost impression on the obverse field, particularly visible in the open areas around Liberty's figure and on the fields near the border.
The 1918/7-S overdate is specifically noted in numismatic literature as being particularly prone to die clash marks — many examples of this already-rare variety show heavy clashing in Liberty's gown area. PCGS and NGC do not issue separate designations for die-clashed coins in standard grading, but specialist publications document specific die states by their clash intensity and location.
For common-date 1918 quarters in circulated condition, light die clash marks add minor numismatic interest without dramatically affecting value. However, on a mint state coin with strong clash impressions clearly visible across the obverse field, collector interest rises meaningfully — die-state enthusiasts and Standing Liberty specialists actively seek prominent clash examples, particularly for the more storied 1918-S issues.
Most Famous Rarity in MS
$250 – $59,800
1918-P Philadelphia Mint State Rarity
Despite its high mintage of 14,240,000, the 1918 Philadelphia issue is considered one of the rarest Standing Liberty quarters in true mint state condition — a fact that surprises many collectors. PCGS numismatic expert David Hall has noted specifically that the 1918 is "one of the rarest of all Philadelphia mint Standing Liberty quarters in mint state condition," and is "very rare in Gem Full Head condition."
This paradox of high mintage but low mint-state survival rate is explained by the coin's workhorse role during World War I. The 1918 Philadelphia quarter circulated heavily, and most examples were spent within months or years of production. The few survivors that reached the numismatic market decades later were almost always well-worn; mint-fresh rolls were not saved by the coin-collecting public of that era.
NGC census data shows only 554 total mint state 1918-P examples have been graded, a surprisingly small number for a coin with over 14 million produced. In grades MS65 and above with Full Head, examples are genuinely scarce, and a gem example with blazing luster and full strike becomes a centerpiece-quality coin. The value range in gem mint state stretches from approximately $1,650 to $59,800 for the finest Full Head examples.
