His Story Treasures Presents
朝鮮 常平通寶 訓十 士 母錢
Joseon Dynasty Sangpyeong Tongbo
Hunryeondogam Issue • “Hun 10 / Sa” • Mother Coin
Korea • Certified 極美 90
The Coin That Made Coins
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The Story
Most old coins were made to be spent.
This one was made for something different.
It was made to create other coins.
This remarkable Sangpyeong Tongbo has been certified as a 母錢 — a “Mother Coin” — placing it within the production process behind one of the most important monetary systems in pre-modern Korea.
Its four bold characters read:
常 平 通 寶
Sangpyeong Tongbo
For generations, these familiar square-holed copper-alloy coins passed through the hands of merchants, farmers, craftsmen and officials across the Joseon Kingdom.
They paid for food in markets.
They settled debts.
They were strung together in quantity and carried through towns and villages.
But before ordinary circulation coins could exist, carefully prepared prototypes were required to reproduce their designs.
That is where the mother coin entered the story.
This was not merely money.
It was part of the process by which money itself was born.
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The Coin That Made Coins
Traditional East Asian cash coins were generally produced by casting rather than striking.
In a casting system, the quality of the model used to prepare the molds mattered enormously.
A mother coin — 母錢 — occupied a special position within that process.
Rather than being intended primarily for everyday circulation, a mother coin served as a carefully prepared model associated with the reproduction of the design from which subsequent casting molds and coins could ultimately be produced.
That makes a mother coin fundamentally different in purpose from an ordinary cash coin.
Thousands upon thousands of circulation coins might eventually enter commerce.
The mother coin stood much closer to the beginning of that manufacturing chain.
It was, quite literally, an ancestor of money.
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常平通寶
Sangpyeong Tongbo can be translated approximately as:
“Circulating Treasure of Constant Peace.”
The inscription is read in the traditional cross pattern:
Top — 常
Bottom — 平
Right — 通
Left — 寶
Together:
常平通寶
Sangpyeong Tongbo became one of the defining coinages of Korea's Joseon Dynasty.
Although early issues existed before widespread adoption, large-scale circulation expanded during the later 17th century as Korea increasingly developed a monetized commercial economy.
The distinctive round coin with a square central hole became a familiar object of everyday Korean life.
Today, Sangpyeong Tongbo is perhaps the most recognizable traditional Korean cash coin.
Yet within this enormous series are countless varieties distinguished by mint, denomination, furnace, series and additional reverse characters.
This specimen belongs to a much more specialized category.
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訓 — The Military Mint
The certification identifies this specimen with the character:
訓
Hun.
This abbreviation is associated with the 訓鍊都監 — Hunryeondogam, or Military Training Command.
The Hunryeondogam was one of the major military institutions of the Joseon state and was among the government authorities involved in producing Sangpyeong Tongbo coinage.
This is an important reminder of how differently money could be produced in pre-modern East Asia.
Coinage was not necessarily the exclusive product of a single centralized national mint in the modern sense.
Different government offices and institutions could participate in production.
Their identifying marks now allow numismatists to reconstruct the enormously complex family of Sangpyeong Tongbo issues centuries later.
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訓十 · 士
The reverse attribution adds another layer to this particular specimen.
It is identified as:
訓十 士
The “訓” associates the issue with the Hunryeondogam.
The additional marks distinguish the particular variety within the extensive Sangpyeong Tongbo series.
To a casual observer, these small characters may appear insignificant.
To the specialist collector, they are precisely what transforms Sangpyeong Tongbo from a single coin type into an enormous field of numismatic study.
Different mints.
Different furnaces.
Different series.
Different denominations.
Different calligraphic forms.
Different production stages.
The result is one of East Asia's richest and most challenging cash-coin series.
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A Kingdom Transformed by Money
For much of Joseon's earlier history, everyday economic life did not depend exclusively upon coinage.
Rice, cloth and other commodities could serve important monetary and taxation functions.
The expanding use of Sangpyeong Tongbo represented a profound transformation.
Markets grew.
Commercial exchange expanded.
Taxes increasingly interacted with monetary payments.
Professional merchants became more important.
Coins began moving through increasingly complex networks of trade.
A string of cash could represent groceries.
A larger quantity might settle a commercial transaction.
Money connected villages with towns, merchants with customers, and ordinary households with the fiscal machinery of the Joseon state.
Sangpyeong Tongbo became part of everyday Korean life for generations.
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From Model to Mold to Money
Imagine the minting process centuries ago.
Before furnaces were fired and batches of circulating cash emerged from their molds, the design had to be established.
Characters needed definition.
The square hole required proper form.
The rims and fields needed the correct proportions.
A carefully prepared mother coin helped transmit that design into the casting process.
From models came molds.
From molds came coins.
And from those coins came commerce.
That is what makes a mother coin so fascinating.
An ordinary Sangpyeong Tongbo tells the story of money being used.
A mother coin tells the story of money being made.
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A Survivor of Joseon Korea
The Joseon Dynasty endured for more than five centuries.
During that extraordinary span, Korea experienced periods of peace, devastating invasions, political struggles, intellectual flowering, economic transformation and increasing encounters with the wider world.
Sangpyeong Tongbo witnessed much of that history.
Its longevity meant that generations of Koreans recognized essentially the same four characters:
常平通寶.
The coin became so deeply embedded in Korean material culture that surviving examples today are not simply numismatic objects.
They are artifacts of everyday Joseon civilization.
This certified mother coin brings the collector even closer to the manufacturing system behind that civilization's money.
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Exceptional Preservation
The certification service has assigned this specimen:
極美 90
The coin measures approximately:
24.5 mm in diameter
1.3 mm in thickness
4.2 grams in weight
The photographs show strong and clearly defined central characters, an attractive dark bronze surface and substantial surviving detail.
The square central hole remains strongly framed, while the overall presentation gives the piece considerable visual presence despite its compact size.
As with any historical cast coin, collectors should carefully examine all photographs for the precise surfaces, patina, casting characteristics and condition.
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Certified Example
Certification information:
Name:
常平通寶
Sangpyeong Tongbo
Dynasty:
Joseon Dynasty
Denomination:
小平 / Small denomination
Variety:
訓十 士母錢
Classification:
母錢 / Mother Coin
Grade:
極美 90
Diameter:
24.5 mm
Thickness:
1.3 mm
Weight:
4.2 g
Certification Number:
B3U35CO889
The certification information and QR code are displayed directly on the holder.
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Why This Coin Matters
An ordinary historical coin can tell us what people spent.
A mother coin can tell us how their money came into existence.
That distinction gives this piece a special place within the Sangpyeong Tongbo series.
It combines several desirable elements:
Joseon Dynasty history.
Classic Korean cash coinage.
Hunryeondogam attribution.
Specialized reverse variety.
Mother-coin classification.
High certified grade.
And an unusually direct connection to the technology of traditional coin production.
For collectors of Korean coins, East Asian cash, minting technology or historical monetary systems, this is far more than another Sangpyeong Tongbo.
It represents the manufacturing history behind the currency itself.
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Specifications
Country:
Korea
Dynasty:
Joseon Dynasty
Coin:
Sangpyeong Tongbo
Chinese Characters:
常平通寶
Korean:
상평통보
Mint Attribution:
訓 — Hun / Hunryeondogam
Variety:
訓十 士
Type:
母錢 / Mother Coin
Denomination:
小平
Composition:
Copper Alloy
Diameter:
24.5 mm
Thickness:
1.3 mm
Weight:
4.2 g
Grade:
極美 90
Certification Number:
B3U35CO889
Condition:
Certified historical coin. Please examine all photographs carefully for the exact condition, patina, surfaces and casting characteristics.
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Collector's Note
Sangpyeong Tongbo offers one of the deepest collecting fields in traditional Korean numismatics.
A collector can begin with a single ordinary example and eventually discover an entire world of mint marks, denominations, furnace numbers, symbols, calligraphic variations and specialized production pieces.
Mother coins occupy an especially interesting position within that world because their significance extends beyond denomination or variety.
They reveal something about the manufacture of the currency itself.
This example therefore belongs equally to the history of Korean money and to the history of how traditional East Asian coins were produced.
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His Story Treasures
Every coin tells a story.
Some coins bought food.
Some paid taxes.
Some crossed markets in the hands of merchants.
But before those coins could circulate, something had to give them their form.
This was the role of the mother coin.
Not simply a coin made to circulate —
but a coin made to create coins.
A remarkable survivor from the monetary world of Joseon Korea.
A piece of history you can hold.