---
title: "Value and Basic Knowledge for Collecting Expo Commemorative Coins"
url: "https://ittendo.com/en/article/news-jp-1379-c90b3ed2"
site: "ITTENDO"
type: "article"
category: "記念貨幣"
published: "2026-09-10T22:00:00Z"
source: "一点堂編集部"
source_url: "https://ittendo.com/"
lang: "en"
---
# Value and Basic Knowledge for Collecting Expo Commemorative Coins

> The Expo commemorative coins were issued to commemorate EXPO '70 in 1970 and are recognized for their historical and cultural value. Unopened bank rolls have high collectible value, with their condition and rarity affecting their price. Interest in the old Expo is rekindling as the 2025 Osaka Expo approaches, increasing attention in the collector market.

The Expo commemorative coins issued to commemorate the Japan World Exposition of 1970 are significant items symbolizing Japan's economic and technological prowess at the time. Deeply understanding the history and value of these coins provides insights into Japanese society during that era.

---

## Introduction to Expo Commemorative Coins

The Japan World Exposition held in 1970 (EXPO '70) was an international event emblematic of Japan's period of rapid economic growth, and to commemorate this, 100 yen cupronickel coins were issued. This commemorative coin is Japan's second commemorative coin, following the 1964 Tokyo Olympic commemorative coin. Made of Cu 750/Ni 250 cupronickel, it lacks the intrinsic value of silver coins, but its affordability contributed to its wide circulation. Beyond its function as currency, the commemorative coin serves as an important resource for understanding the historical context of the time.

The Japan World Exposition, under the theme "Progress and Harmony for Mankind," was the largest international event after the war, with participation from 77 countries and approximately 64,210,000 visitors. The Tower of the Sun (designed by Taro Okamoto) remains a beloved landmark in Osaka. This Expo, held only six years after the Tokyo Olympics, is historically recognized as a national project that showcased Japan’s economic and technological strength to the world during a period of rapid growth. It is also recognized as a symbol of the "Showa Retro" culture of the 1970s, with its commemorative coins marking memories of that era and becoming one of the [factors that determine the value of old coins](/coinpedia/basics-001-value-drivers).

Thus, Expo commemorative coins epitomize Japan's economic revival and international success, and understanding their issuance background allows one to capture the enthusiasm and development of Japanese society at that time. By learning more about the [Expo commemorative coins](/coinpedia/kinen-002-expo70), one can gain deeper insights into their historical value.

## Historical Background and Modern Evaluation of Expo Commemorative Coins

The 100 yen cupronickel coins commemorating the Japan World Exposition were issued to celebrate EXPO '70 held in 1970. The design of this coin features the emblem of the exposition, symbolizing the integration of the five continents and world peace. The reverse side boldly depicts the earth and the inscription "EXPO'70", embodying international cooperation and hope for the future. Such designs reflect the graphic design trends of the time and employed the pinnacle of minting technology.

Though made of Cu 750/Ni 250 cupronickel, and lacking the precious metal intrinsic value of silver coins, their artistic merit and historical significance form the core of their collectible value. According to [criteria for grading old coins](/coinpedia/basics-003-grading), specimens that retain detailed designs are highly valued.

At the time of issuance, these coins were sold at a special shop on the EXPO '70 premises, and many visitors purchased them as souvenirs. Those distributed in a special plastic package are known as valuable items that convey the excitement of the era. Of the 64,210,000 attendees, it's believed that many acquired these commemorative coins, and many remain in households across the country today.

The Expo commemorative coins sparked a national boom, treasured by people of all ages as a memory of the Expo. This background also influences their evaluation in modern times. Unopened items or those in good condition remain of interest among collectors, and are anticipated to appear on the market. These coins maintain their status as a "national coin" reflecting the societal climate at the time of their issuance.

## Recent Auction Levels of the Commemorative Coin Category

To analyze the recent auction status of the commemorative coin category, we examine data for the 90 days leading up to September 11, 2026. The median auction price during this period was ¥6,050, with 2 transactions recorded. In the previous 90 days, the median auction price was ¥1,000, with 1 transaction. With fewer than 10 transactions, no fluctuation rate or reliability can be calculated.

Specific auction examples include a commemorative coin from Fukuoka Chikuzen auctioned for ¥2,600 on August 26, 2026. On July 3, 2026, a rare error coin, a Korean 500 won commemorative coin, was auctioned for ¥9,500. Further, on May 24, 2026, a commemorative coin from Fuji Fan Style was traded for ¥1,000, and a Nagano Olympic commemorative coin was traded for ¥600 on March 6, 2026. For Tokyo Olympic coins, a 100 yen commemorative coin from the 1964 Tokyo Olympics was auctioned for ¥750 on March 2, 2026, with a 1,000 yen commemorative coin from the same event auctioned for ¥8,000 on the same day.

These data indicate that transactions in the commemorative coin category occur across a wide price range, suggesting that the rarity and condition of individual coins might influence prices. However, due to the small number of transactions, these figures serve only as directional indicators and may not accurately reflect the entire market trend. For a detailed understanding of price trends, refer to [price trend charts](/market/index) or [auction history listings](/auctions).

## Factors Determining the Value of Expo Commemorative Coins

The Expo 100 yen cupronickel coins are generally traded at slightly above face value as circulation products. However, factors such as condition, rarity, and authenticity risk greatly influence their market value. Especially noteworthy are the so-called "bank rolls" of unopened sets of 50 coins that hold high rarity value due to their pristine unused condition, having been preserved by financial institutions.

Bank rolls, with their original production sequence intact, serve as invaluable sources for studying die differences and manufacturing variations, adding academic value not found in standard circulation products. Collectors highly regard bank rolls as "top items of the collection," valued for their supreme preservation condition and historical background, and they are carefully preserved. To maintain the value of such coins over the long term, practicing [correct storage methods for old coins](/coinpedia/basics-006-hokan) is recommended.

Regarding authenticity risk, the risk is considered low for Expo commemorative coins due to their high issuance volume and relatively easy distinguishability. However, collectors and experts regularly refer to [methods for distinguishing authenticity](/guide/fake-detection) to ensure reliable appraisals. This approach helps reduce authenticity risks, enhancing market trust.

As we near the 2025 Osaka Kansai Expo, interest in the old Expo is rekindling, causing a slight upward trend in market prices for Expo commemorative coins. Understanding the impact of such events on the market is crucial to gauging trends in the old coin market. Market records indicate consistent tendencies of event impacts on price fluctuations, allowing future trend predictions through appropriate understanding. Thus, the value of Expo commemorative coins fluctuates with condition, rarity, authenticity risk, and historical and market trends.

## Acquiring and Key Considerations for Expo Commemorative Coins

When acquiring and holding Expo commemorative coins, several practical points need confirmation. First, when considering mint sets that include the Expo commemorative coins issued in 1970, it's essential to check whether all original Mint Bureau packaging parts are complete. Sets preserved unopened tend to trade at high prices, with significant differences in value in the collector market.

Additionally, special package sets sold exclusively at the Expo site or sets combined with other memorabilia exist. These sets hold high rarity and often trade at premium prices compared to regular mint sets. When acquiring such sets, understanding the set's content, condition, and the background at the time of sale is crucial.

These mint sets serve as clues for understanding purchase methods and acquisition sources, and consulting the [Guide on Acquisition Sources and Purchase Methods for Old Coins](/coinpedia/basics-008-shotai) facilitates making informed decisions.

Furthermore, Expo commemorative coins hold a significant place as part of Japan's commemorative coin collection. Arranging series in chronological order offers the enjoyment of tracing Japan's postwar history through coins. Particularly as cupronickel coins, they have low storage costs, making them easy for beginners to own. For storage methods, refer to the [Correct Storage Methods for Old Coins](/guide/storage).

Thus, when acquiring and holding Expo commemorative coins, confirming their original condition and set rarity while thoroughly understanding market value is essential. This boosts collector satisfaction.

## Cultural Value and Future Prospects of Expo Commemorative Coins

Expo commemorative coins carry cultural value as historical artifacts reflecting their era. Specifically, the 1970 Expo commemorative coins are emblematic of Showa history, with their value being re-evaluated in light of the 2025 Osaka Kansai Expo. The issuance of new commemorative coins brings fresh attention as a new trend alongside the 1970 coins. Such movements are also observed through increased media interest, museum exhibitions, and coin shows.

Long-term ownership of Expo commemorative coins is a practical approach to expecting a rise in cultural value as "Showa Retro." Historical milestones such as 60 or 75 years post-issuance present opportunities for re-evaluation of their cultural and historical significance.

Thus, Expo commemorative coins serve as collectible items for enjoying historical and cultural value rather than solely focusing on price increases. In markets where collectors and investors participate, approaches considering cultural value are crucial, offering value that transcends generations. This perspective is also prioritized by ITTENDO, allowing deeper understanding and enjoyment when utilizing functions like [monitoring coin prices with Vault](/vault).