---
title: "Basic Knowledge for Identifying the Value of Kanei Tsūhō (寛永通宝) — Methods for Judging Script Style, Reverse Characters, and Mother Coins"
url: "https://ittendo.com/en/article/news-jp-1373-76475943"
site: "ITTENDO"
type: "article"
category: "穴銭"
published: "2026-09-04T22:00:00Z"
source: "一点堂編集部"
source_url: "https://ittendo.com/"
lang: "en"
---
# Basic Knowledge for Identifying the Value of Kanei Tsūhō (寛永通宝) — Methods for Judging Script Style, Reverse Characters, and Mother Coins

> Kanei Tsūhō (寛永通宝) was Japan's primary currency in circulation for approximately 230 years from 1636. Differences in the manufacturing systems of Ko-Kan'ei (古寛永) and Shin-Kan'ei (新寛永), the price gap between mother coins and circulating coins (which can exceed 100 times), how to read the reverse characters that indicate the mint, and authenticity assessment through script style all influence value judgments when collecting. Verifying condition and selecting reliable sources of acquisition are also important.

Kanei Tsūhō (寛永通宝), which supported the Japanese economy throughout the Edo period, produced a wide variety of types depending on the place and period of casting. Even among coins of the same denomination, value differs greatly depending on the script style, reverse characters, and whether a coin is a mother coin or a circulating coin. The methods for distinguishing these differences are explained from the basics.

---

## The Basic Form of Kanei Tsūhō and the Diversity Generated by Two Manufacturing Systems

Kanei Tsūhō is a copper coin whose casting began in 1636 and which circulated as Japan's primary currency for approximately 230 years until the early Meiji period. It is a round, square-holed coin approximately 24 mm in diameter and approximately 3.5 g in weight, with the four characters "寛永通宝" cast on either side of the square central hole. This long lifespan played an indispensable role in the economic development and social stability of the Edo period.

A notable feature of Kanei Tsūhō is that, because it was cast at mints throughout the country, a wide variety of types emerged in terms of script style, material, and even size. This diversity makes it an inexhaustible subject of exploration for modern antique coin collectors.

In terms of classification by casting period, coins are broadly divided into Ko-Kan'ei (古寛永, "old Kan'ei") and Shin-Kan'ei (新寛永, "new Kan'ei"). Ko-Kan'ei was produced at private mints throughout the country from 1636 through the Meireki period (1655–1658). As a result, script style variations are extremely rich, and the diversity is such that no two are said to be identical.

Shin-Kan'ei, on the other hand, began production at mints under direct shogunal control from 1668 onward. With standardized specifications and an established mass-production system, quality stabilized and distribution nationwide was facilitated. Nevertheless, minute differences between mints and changes in script style over time continued to exist. Mints such as the Edo Kameido mint with its reverse "文" (bun) character, the Sendai Ishinomaki mint with its reverse "千" (sen), the Sado mint with its reverse "佐" (sa), the Osaka Kōzu mint with its reverse "元" (gen), the Nanbu domain mint with its reverse "盛" (mori), and the Ashio mint with its reverse "足" (ashi) each formed groups of individual coins with their own distinctive characteristics, and they continue to be a deeply rewarding subject of collecting for advanced collectors.

Welcome to [the world of Kanei Tsūhō](/coinpedia/ana-sen-002-kanei-tsuho).

## Mother Coins and Circulating Coins — The Hierarchical System That Supported Circulation and the Current Evaluation Criteria

In understanding the value of Kanei Tsūhō, the distinction between "mother coins" (母銭, bosen) and "circulating coins" (通用銭, tsūyōsen) cannot be avoided. These two concepts reflect the very structure of the Edo-period monetary manufacturing system and are a major fork in the road for current market evaluation.

Mother coins were the original models used to create the casting molds for producing the circulating coins that actually entered circulation. They were engraved with extreme precision, their characters are crisp, the finishing of the coin surface is beautiful, and they are characteristically slightly larger in size than circulating coins. Circulating coins, on the other hand, are utilitarian coins mass-produced using molds created from mother coins. This hierarchical structure inherent in the manufacturing process is directly linked to present-day rarity evaluations.

Because mother coins exist in only a fraction of the number of circulating coins, even for the same script style, a mother coin can command a price more than 100 times that of a circulating coin. Ordinary Kanei Tsūhō circulating coins are traded at around a few dozen yen per piece, but mother-coin class coins reaching tens of thousands of yen to hundreds of thousands of yen are not uncommon. This price difference reflects not merely a difference in quantity, but a difference in the role played within the historical manufacturing process.

Kanei Tsūhō has types cast at multiple mints — including the Edo Kameido mint, the Sado mint, and the Ashio mint — and furthermore, different script styles were used at each mint. Reverse characters such as bun (文), sen (千), sa (佐), gen (元), mori (盛), and ashi (足) functioned as markers indicating the place and period of casting. This taxonomic diversity, combined with the various patterns of mother coins and circulating coins, has made evaluation among today's collectors complex.

The rarity of mother coins is a particularly important factor among those that determine the value of antique coins. Their existence conceals artistic and historical value beyond that of mere currency, and they function as records of Edo-period monetary policy and manufacturing technology.

## Recent Auction Price Levels for the Entire Hole-Coin Category

The market trends for the hole-coin (穴銭) category as a whole, read through the most recent data.

As of the reference date of September 5, 2026, the median hammer price for the 90-day period from June 8 to September 5, 2026 was ¥1,850, covering 48 lots. For the preceding 90-day period (March 10 to June 7, 2026), the median was ¥1,500, with 61 lots concluded. This comparison shows a 23.3% increase recorded across the hole-coin category as a whole. Both periods had a sample size of 30 or more lots, and reliability is assessed as moderate.

Looking at individual auction records, the range of variation is large. On September 4, 2026, a Tenpō Tsūhō (天保通宝) sold for ¥1,750, while a Kanei Tsūhō jūji-kan iron coin (寛永通宝十字寛鉄銭) on the same day went for ¥1,080. On August 26, 2026, there is a record of a Tenpō Tsūhō Tamatsuka Tenpō commemorative coin reaching ¥15,100, while on August 25 of the same month a Tenpō Tsūhō concluded at ¥700.

This wide range reflects the differences in value by type, mint, and condition within the hole-coin category. To understand prices by individual coin type and mint, [viewing the auction history in list form](/auctions) allows for a more detailed grasp of transaction patterns. Also, [checking the price trend on the market chart](/market/index) will clarify how this upward trend is positioned within a longer-term context.

The rise in the median for the category as a whole is an indicator of the direction of market demand, but it differs from the prices of individual coin types and mints within the world of Kanei Tsūhō. The overall trend for hole coins and the price movement of specific types and reverse-character varieties must be examined separately.

## Authenticity and Place of Origin as Reflected in Script Style and Reverse Characters

**The greatest factor distinguishing the value of Kanei Tsūhō lies in identifying the mint and period indicated by the script style and reverse characters.** Even among coins of the same Kanei Tsūhō denomination, the classification differs greatly depending on where and when they were cast, which in turn influences market evaluation.

### The Individuality of Mints Engraved in Script Style

In Ko-Kan'ei, notable differences in script style are seen depending on the casting mint and period. Minute differences such as the shape of the "宝蓋" (treasure-cover radical) at the top of the character "寛," the balance of the "廿" within it, the angle and upward flick of the two-stroke water radical in "永," the manner in which the "しんにょう" (road radical) of "通" is swept and the position of its dot, and the number of strokes in the "貝" (shell) component of "宝" and the overall proportions — all become clues for identifying the place of origin and period. The ability to accurately "read" these fine details of the characters is indispensable in authenticating Ko-Kan'ei. Overlooking differences in script style leads to misclassification and to missing the true value of an individual coin.

### The Proof of the Mint Shown by Reverse Characters

Many Shin-Kan'ei coins have specific characters or symbols cast on the reverse, and these serve as important clues indicating the mint and period. The reverse character "文" (bun) indicates the Kanbun period of the Edo Kameido mint; "千" (sen) indicates the Sendai Ishinomaki mint; "佐" (sa) indicates the Sado mint; "元" (gen) indicates the Kanpō period of the Osaka Kōzu mint; "盛" (mori) indicates the Nanbu domain Morioka mint; and "足" (ashi) indicates the Ashio mint — in this way, the type of reverse character almost uniquely identifies the place of casting.

In cases where nothing is cast on the reverse — known as "mubun" (無文, "no inscription") — there is a tendency for these to have been cast at Edo-area mints. Simply confirming the presence or absence of a reverse character and its type makes it possible to narrow down the approximate place of origin and period.

### Judgment of Authenticity and Individual Variation

The combination of script style and reverse characters simultaneously serves as the key to authenticating genuine coins. An individual coin that deviates from the documented script-style characteristics of a given mint raises the possibility that it dates from a different casting period or is a later imitation cast. By verifying the consistency of the script style in conjunction with the condition of the individual coin (rust, wear, presence of casting flash), the accuracy of authenticity judgment is enhanced. Understanding the perspective of condition assessment in [the standards and interpretation of antique coin grading](/guide/grading) is also useful for accurate authentication.

The more of these multiple conditions that coincide, the more clearly the coin's reliability as an individual piece and its position in the market are established.

## Verifying Condition and Source of Acquisition

When acquiring Kanei Tsūhō, the first thing to verify is the degree of deterioration of the coin surface. The blue-green patina (青錆, "blue rust," i.e., verdigris) seen on copper surfaces is a stable oxide film that protects the copper and is often evaluated positively as a sign of age. On the other hand, locally raised, powdery "active rust" is different. This indicates ongoing corrosion, and if left untreated, it can cause the characters to dissolve or the coin surface to be damaged, so prompt treatment is required. If such active rust is discovered, it is safest to avoid acting on one's own judgment and instead show the coin to a trusted expert. For information on maintaining the storage environment, details can be confirmed at [the correct methods for storing antique coins](/guide/storage).

The next important step is preparation of knowledge before acquisition. Before beginning to collect Kanei Tsūhō, it is recommended to learn the basic classifications and characteristics. Having acquired knowledge, it is important to visit auction sites and the exhibition sales of trustworthy antique coin dealers, and to accumulate experience handling many actual coins.

At the introductory stage, an effective approach is to begin with "sorting" — acquiring a large quantity of inexpensive Shin-Kan'ei circulating coins and searching among them for various script-style and reverse-character variants. Through this process one's eye becomes trained, and eventually the possibility of discovering rare, as yet unevaluated variants may arise. Regarding the selection of reliable sources of acquisition, verifying the reputation of antique coin dealers and their track records from past transactions will help avoid problems later on.

## Perspectives for Assessing the Value of Kanei Tsūhō

Kanei Tsūhō, as the primary currency that supported the Edo economy, holds a significance that transcends the realm of mere old coins. Over the more than 230 years from the start of casting in 1636, its stable supply made Japan's monetary economy self-sufficient and dramatically changed the social structure that had previously depended on Chinese coinage. Its spread as a nationwide unified currency promoted the development of a commodity economy and penetrated monetary economics down to the level of ordinary people — it is the very foundation of Edo-period society.

What distinguishes the value of a collection is the "discerning eye" informed by this historical background. From bulk lots of circulating coins to rare mother coins, to differences in mints indicated by reverse characters, Kanei Tsūhō encompasses multi-layered classifications. Reverse "文" (bun) for the Edo Kameido mint, reverse "千" (sen) for the Sendai Ishinomaki mint, reverse "佐" (sa) for the Sado mint, reverse "元" (gen) for the Osaka Kōzu mint, reverse "盛" (mori) for the Nanbu domain mint, reverse "足" (ashi) for the Ashio mint — understanding this correspondence between reverse characters and places of casting brings the value of a single coin into sharp focus. Knowing the differences in script style between mother coins and circulating coins, and the characteristics of rare variants, is the key that opens the depth found in collecting.

In the market, active trading is constantly conducted at the largest specialist antique coin auction in Japan, and there are also highly reliable purchasing sources through antique coin dealers affiliated with the Japan Coin Dealers' Cooperative (日本貨幣商協同組合). When you find a coin that interests you, [monitoring its price in the Vault](/vault) allows you to track its market price movements. Sensing the breath of the Edo economy through Kanei Tsūhō while judging its true value — that is ITTENDO's approach to collecting.