San Francisco Strikes Coins Again After a Ten-Year Pause

A Minting City Returns to the Coinage Business

September 1, 1965, was a quiet but consequential date in United States coinage history. In San Francisco, a federal facility that had once been one of the nation's principal branch mints again began striking finished coins. The United States Mint's historical timeline records the event directly: under the Coinage Act of 1965, minting operations at the San Francisco Assay Office were reactivated on September 1 with the striking of pennies.

The restart ended a ten-year interruption in coin production. San Francisco had ceased regular coining operations in 1955. In 1962, Congress formally changed the facility's status from a mint to an assay office. Yet by the middle of the next decade, the federal government urgently needed every practical source of coin-production capacity it could find.

The reason was the great coin shortage of the 1960s—a crisis severe enough to change the composition of American dimes, quarters and half dollars, suspend traditional Proof Set production, encourage extraordinary production schedules, revive old machinery, and temporarily return San Francisco to the business of making circulating coins.

The cents that began coming off San Francisco's presses on September 1 therefore represented much more than another production run. They were evidence of a national emergency response already reshaping the United States monetary system.

San Francisco's federal minting history stretched back to the California Gold Rush. The first San Francisco Branch Mint opened in 1854, giving the federal government a western coinage facility close to the enormous quantities of gold flowing from California. A second building—the famous Old Mint or “Granite Lady”—opened in the 1870s, and the operation later moved to the imposing third San Francisco Mint building on Hermann Street in 1937.

But coinage requirements and federal production strategy changed. In 1955, regular coin production in San Francisco was discontinued. The Philadelphia and Denver facilities would carry the principal burden of producing circulating coins.

Congress changed San Francisco's official status in 1962, making the facility the United States Assay Office at San Francisco. The change did not make the building useless. It continued to perform federal monetary work, and its existence would soon prove unexpectedly valuable.

By 1964 and 1965, the assumption that Philadelphia and Denver could comfortably satisfy the country's coin needs was being tested on a scale few had anticipated.

The Coin Shortage Becomes a National Problem

The early 1960s brought rapidly increasing demand for circulating coinage. Population growth, expanding commerce, vending machines, parking meters and other coin-operated equipment all formed part of a monetary economy that required huge quantities of small change. At the same time, rising silver prices and public attention to changing coin values contributed to the disappearance of coins from normal circulation.

Whether collectors and speculators deserved all the blame sometimes directed at them was debatable, but the shortage itself was unmistakable. Banks and businesses struggled to obtain enough coins. The Mint pushed production aggressively, yet demand continued to outrun the available supply.

The Treasury's response became a genuine industrial mobilization. Mint facilities operated extended schedules. Additional machinery was acquired. Proof coin production was suspended after 1964 so that equipment and personnel could be redirected toward ordinary circulating coinage. The government obtained coinage-metal strip from private industry and even recovered or repurposed equipment where possible.

San Francisco was already contributing before it resumed striking finished coins. Treasury records describe how space there was reacquired and equipped for blanking, annealing, cleaning and upsetting bronze and cupronickel planchets. By the spring of 1965, San Francisco was supplying Denver with all of its one-cent and five-cent blanks.

That was useful, but Washington wanted more. The emergency was serious enough that the government wanted San Francisco's presses making finished coins again.

President Lyndon B. Johnson addressed the issue while proposing the legislation that became the Coinage Act of 1965. His administration noted that coinage operations in San Francisco had ended in 1955 and that the facility had subsequently become an assay office. Although it was already preparing coin blanks, existing law prevented it from returning to full minting.

The administration argued that this restriction had become impractical. The country needed additional capacity while it introduced new coinage and continued producing enormous quantities of existing denominations. Johnson therefore asked Congress for authority to reactivate coin production at San Francisco on a temporary basis.

The request reveals how the government viewed the facility. San Francisco was not initially being restored because officials had decided the nation permanently needed three full circulating-coin mints. The reactivation was an emergency measure intended to bridge the production gap while a new, modern Philadelphia Mint was being planned and built.

Congress agreed.

The Coinage Act of 1965 Opens the Door

President Johnson signed the Coinage Act of 1965 on July 23. The law is remembered primarily for one of the largest changes in the physical composition of United States circulating money in the twentieth century: silver was eliminated from the dime and quarter, while the half dollar's silver content was reduced.

But the act did more than authorize clad coinage.

Section 201 specifically addressed San Francisco. It permitted the facilities of the United States Assay Office there to be used for producing coins until the Secretary of the Treasury determined that the nation's mints were capable of producing ample supplies without it.

That provision supplied the legal authority needed to turn San Francisco's preparation work into full-scale coin manufacture.

Just over a month after the act became law, the presses were running.

On September 1, 1965, San Francisco resumed striking finished coins. Contemporary numismatic reporting described four stamping presses operating as production began, with one-cent pieces first and five-cent pieces also planned.

The choice of the cent was fitting. A national coin shortage was not simply a problem involving silver denominations. The economy required staggering numbers of cents and nickels as well. Producing those low-denomination coins consumed immense industrial capacity.

San Francisco's first production after its decade-long pause therefore did not consist of glamorous commemoratives or precious-metal pieces. It consisted of the workhorse of American commerce: Lincoln cents.

By the end of calendar year 1965, numismatic research based on Mint annual-report figures places San Francisco's cent output at roughly 196.6 million pieces. That was only the beginning. Treasury reporting states that from September 1965 through June 1966, the San Francisco facility manufactured more than half a billion finished coins.

For a plant that had not struck circulating coins in ten years, the comeback was substantial.

A Strange Detail: San Francisco's Coins Had No “S”

Modern collectors naturally associate San Francisco coinage with the “S” mint mark. Yet the coins produced during the emergency reactivation present a fascinating complication: they generally did not identify themselves as San Francisco products.

Congress and the Treasury had taken extraordinary steps to discourage the public from removing newly produced coins from circulation. One such measure was the temporary elimination of mint marks from circulating coinage. Officials hoped that reducing date-and-mint varieties would weaken speculative and collecting pressure at a time when every coin was needed in commerce.

As a result, a cent struck in San Francisco during this period could be indistinguishable by mint mark from a cent struck in Philadelphia. The familiar “S” did not announce its birthplace.

This makes the September 1 restart unusual from a collector's perspective. It is a clearly documented event in Mint history, yet an individual ordinary cent from that production cannot simply be flipped over and identified as one of the historic first-day San Francisco pieces.

The importance lies in the production history rather than in a readily visible mint mark.

The mid-1960s coin shortage also disrupted the normal relationship between the calendar and the date stamped onto a coin.

In an effort to discourage hoarding of newly dated pieces, Congress had authorized the Mint to continue using the “1964” date beyond the end of calendar year 1964. Treasury reporting specifically lists retention of the 1964 date as one of the government's anti-shortage measures.

Consequently, the fact that San Francisco resumed coin production on September 1, 1965, does not mean the first cents struck there that day necessarily carried a 1965 date. Numismatic records identify San Francisco as producing 1964-dated cents during its renewed operations, without a mint mark.

This is one of the most counterintuitive features of the era. A coin could be physically manufactured in San Francisco in 1965, display the date 1964, and carry no “S.”

For anyone accustomed to treating the date and mint mark as a coin's straightforward birth certificate, the emergency coinage of 1964–1966 is a reminder that Mint history can be considerably more complicated.

The Coin Shortage Changed the Rules

The unusual San Francisco cents were part of a much larger effort to break the shortage.

The Mint had already suspended Proof Set production, freeing personnel and equipment for circulating coins. It continued using earlier dates when legally permitted. Mint marks disappeared temporarily. Philadelphia and Denver expanded production. San Francisco prepared planchets and then returned to striking coins. The federal government was simultaneously changing the metallic composition of major denominations.

The Coinage Act's most visible legacy was clad coinage. Traditional 90-percent-silver dimes and quarters were replaced by copper-nickel clad coins with a pure copper core. The Kennedy half dollar moved from its original 90-percent-silver composition to a reduced-silver clad structure containing 40 percent silver overall.

The transition itself took time. Old and new coinage overlapped in production, and the dates on the pieces did not always correspond neatly with the year in which they were struck. The result is one of the most historically interesting periods in modern American numismatics.

San Francisco's September 1 restart sits directly in the middle of that transition.

The scale of the Mint's response is easy to underestimate when viewed one coin at a time. Treasury records describe billions of coins being manufactured under what was effectively a crash program.

Mint Director Eva Adams oversaw much of that effort. During her tenure, operating divisions expanded and the Mint sought additional machinery and production space. San Francisco's role grew from preparing blanks into full-scale striking. Denver expanded. Philadelphia pushed its existing plant while the government prepared a replacement facility.

The government was not merely trying to create a modest reserve of coins. It was attempting to overwhelm a national shortage by putting enormous quantities of change into the economy.

Later Mint statements credited production of more than nine billion coins in 1966 and more than seven billion in 1967 with eliminating the shortage in most denominations. The strategy ultimately worked.

San Francisco had been brought back because every additional press mattered.

The 1965 authorization was conceived as temporary. Once Philadelphia and Denver possessed enough capacity, San Francisco theoretically would no longer be required for ordinary circulating production.

That did not mean San Francisco disappeared from American numismatics again.

Instead, the facility evolved toward a specialized role. Special Mint Sets were produced there during the years when conventional Proof Sets were suspended. Beginning with 1968-dated coinage, proof production moved to San Francisco, and the “S” mint mark returned prominently to collector consciousness.

The United States Mint notes that San Francisco assumed proof-coin production in 1968. Decades later, in 1988, the facility formally regained its status as a United States Mint rather than an assay office.

Today, San Francisco is closely associated with proof and other numismatic coinage. That modern identity can obscure the emergency that brought its presses back to life in 1965.

Why the September 1 Event Matters to Collectors

There is no easily isolated “September 1, 1965 San Francisco cent” that collectors can identify by an S mint mark and place in an album as a first-day issue. That may make the event seem less tangible than the release of a new commemorative or a dramatic rarity.

Historically, however, it is enormously revealing.

The restart demonstrates how much pressure the United States coinage system was under. A facility taken out of regular coin production a decade earlier, later redesignated as an assay office, had to be re-equipped and legally authorized to strike coins again. That did not happen because of nostalgia. It happened because the country needed production capacity.

It also helps explain some of the strangest features of 1960s coins: frozen dates, missing mint marks, enormous mintages, suspended proof production, Special Mint Sets and the rapid adoption of clad coinage.

These features were not unrelated curiosities. They were parts of a coordinated response to the same crisis.

Collectors often focus on the great design transitions of the era—the end of silver dimes and quarters, the change in the Kennedy half dollar, or the visible copper edge of the new clad coins. The humble cent receives less attention because its bronze composition and Lincoln Memorial design did not undergo a comparable transformation in 1965.

Yet the cent was central to the production problem.

A low face value does not mean low demand. Cents circulated in huge quantities and were needed for everyday transactions across the country. Producing hundreds of millions of them required metal, planchets, dies, presses, workers, maintenance, packaging and distribution.

That is why San Francisco had already been preparing cent and nickel blanks for Denver before September 1965. It is also why the first denomination selected when full striking resumed was the cent.

The ordinary Lincoln cent became the vehicle through which San Francisco reentered United States coin production.

From Gold Rush Mint to Emergency Industrial Capacity

The event also connects two very different eras of San Francisco's monetary history.

The city's original branch mint had been created in response to the California Gold Rush. Its purpose was inseparable from the tremendous influx of precious metal in the West. More than a century later, the same minting tradition was revived for almost the opposite reason: the government needed enormous quantities of base-metal small change.

In the 1850s, San Francisco's minting importance came from gold. In 1965, it came from cents, nickels and the raw industrial capacity to help keep commerce supplied with coins.

That contrast captures how the role of the United States Mint had changed. By the twentieth century, the institution was not merely converting precious metal into money. It was operating a vast manufacturing and distribution system essential to everyday retail life.

The San Francisco restart was one milestone in a remarkably compressed sequence of events.

The Coinage Act became law on July 23, 1965. Production of the new clad quarter began at Philadelphia in August. San Francisco resumed striking coins on September 1. Groundbreaking for the new Philadelphia Mint followed later that month. The first clad quarters entered circulation in November. Clad dime production began in December, and other denominations followed as the transition accelerated.

Within months, the physical character of United States pocket change was being rewritten.

That is why September 1 deserves a place on a day-by-day American coin history calendar. It was not merely the reopening of some machinery in California. It was one visible step in the government's effort to stabilize the nation's coin supply while simultaneously carrying out one of the most consequential changes in modern U.S. coinage.

September 1, 1965, produced no famous new design and no instantly recognizable rarity. The cents struck at San Francisco did not even advertise where they were made.

But the date marks the return of an American coinage center after ten years of silence.

The San Francisco Assay Office's presses came back because the United States needed them. The national coin shortage had become serious enough to reverse a decade-old production decision, change federal law, reorganize Mint operations and enlist San Francisco in a massive campaign to flood commerce with needed change.

From that September day forward, San Francisco once again became part of the country's active coin-manufacturing system. Its role would evolve from emergency circulating production to Special Mint Sets and then to the proof coinage for which the facility became famous among generations of collectors.

The modest cent was the coin that started the presses again.

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