Counterfeits of old coins have existed since the Edo period, and in modern times, there has been an increase in those utilizing sophisticated techniques. For collectors and investors, the ability to discern authenticity is a crucial skill.
History of Counterfeits and Contemporary Challenges
Counterfeits of old coins have been around since the Edo period when their value was first recognized. At that time, particularly rare gold and silver coins were privately minted, which sometimes disrupted circulation. After the Meiji period, as coin collecting became a popular hobby, there was an increase in sophisticated counterfeits targeting collectors. In modern times, precisely cast and electroformed products from China are distributed worldwide via the internet. These contemporary counterfeits employ advanced technology, with surface textures and character reproduction improving year by year. Consequently, it is extremely challenging to distinguish authenticity from photographs alone.
Counterfeits are mainly classified into three types: "cast counterfeits," "electroformed counterfeits," and "altered coins." Cast counterfeits involve taking molds from genuine coins and casting metal into them, which can leave fine bubbles or seam lines on the surface. Electroformed counterfeits are created by depositing metal through electrolysis, resulting in a highly precise appearance, but they often have different specific gravity or composition, making weight measurement effective. Altered coins are genuine old coins that have been modified or re-engraved to appear as rarer varieties or different coin types. For instance, common Keichō Tsūhō (寛永通宝) might be re-engraved to mimic the rarer "Nisui Eiraku" (二水永). Since they are based on genuine items, they tend to be difficult to detect and can result in significant financial losses.
To identify counterfeits, precise scales (at 0.01g increments) and caliper measurements are effective. Especially with Edo period gold and silver coins, there were strict official weight standards, and genuine old coins often fall precisely within these standards. For example, the official weight of a Keichō Koban (慶長小判) is about 17.8g, and the Tenpō Koban (天保小判) is about 11.2g, with any deviation exceeding 0.2g raising the possibility of counterfeiting. In contrast, counterfeits, due to differing alloy compositions, frequently deviate from standard weights even when their dimensions are the same. Having reliable measuring instruments at hand is the first step in everyday authentication.
Learning to identify counterfeits is vital for collectors. Those interested are recommended to refer to Introduction to Identifying Counterfeits to acquire foundational knowledge.
The Impact of Historical Background on the Evaluation of Old Coins
When determining the authenticity of old coins, historical background is extremely important. Particularly with Edo period gold coins, there are fine file marks known as "gozame" (ござ目) that were applied during the manufacturing process, which vary by era. For instance, a characteristic of the Keichō Koban is its relatively coarse gozame. These historical manufacturing features significantly influence the evaluation of old coins today.
Counterfeits often have imperfect or unnaturally uniform gozame reproduction, making this an important point for differentiating authenticity. Additionally, in cast counterfeits, tiny bubble marks or seam lines may be visible on the surface. These features differ from the manufacturing techniques of the Edo period and increase the likelihood of the item being counterfeit.
Due to years of use and storage, genuine old coins may show natural wear or patina. In contrast, counterfeit surfaces often have unnatural roughness or excessive smoothness, and this inconsistency serves as an important criterion in authenticity judgments. Through detailed observation, understanding the condition of genuine items enables recognition of counterfeit characteristics.
Additionally, sound and feel constitute auxiliary means for determining authenticity. Genuine gold and silver coins have high density and purity, emitting a clear metallic "ring" when lightly tapped. In contrast, counterfeits often made of different alloys produce a dull "clunk." However, this method requires experience and expertise, making it challenging for beginners.
Feel also plays a role as a supplementary element in authenticity judgments. Gold and silver have high thermal conductivity, giving a cool touch when held, and counterfeits might not replicate this sensation. However, combining physical surface inspection and expert assessments remains crucial for final judgments.
Understanding the historical background and manufacturing techniques is essential when evaluating old coins. This knowledge forms the foundation for identifying counterfeits and directly affects market evaluations. For deeper understanding, refer to Basic Knowledge of Grading and Five Factors Determining Old Coin Value.
Identifying Altered Coins and Their Risks
One factor that greatly influences the value of old coins is their authenticity. Particularly, altered coins (re-engraved pieces) are counterfeit examples where genuine old coins are cleverly processed to mimic high-value items, representing significant risks for investors and collectors. A typical method of alteration involves re-engraving common coin inscriptions to appear as rare calligraphy styles. For instance, this tactic is known regarding Bunkyū Eihō (文久永宝) where particularly rare calligraphy styles are imitated. The way to identify altered coins is to check whether the engraving of the characters and the texture of the surrounding area are consistent. Re-engraved areas often have unnatural gloss differences or uneven engraving depth, necessitating careful observation.
Moreover, methods include trimming edges or parts of characters to mimic different types or error coins and combining fragments of genuine coins to replicate high-value coin types. Especially with joined pieces, weld marks or combinations of different materials may be observed, making edge and thickness observations crucial. Since even experts may find it difficult to identify these altered items, consulting an expert for evaluation is recommended if anything seems suspicious.
Items like Edo gold coins, rare calligraphy cash coins, ancient coins, and imported Chinese coins are particularly targeted as they tend to be expensive per piece, leading to the production of many counterfeits. Especially when purchasing cash coins for ¥10,000 or more or gold and silver coins for ¥50,000 or more, selecting items already authenticated by a reliable third-party organization or purchasing from specialist dealers affiliated with the Japan Numismatic Dealers Association (JNDA) is advisable. Assume there is always a reason behind cheap pricing, and proceed with transactions cautiously.
Ultimately, the extent to which a coin retains its originality determines its value. Possessing knowledge to identify altered coins is an essential step to prevent counterfeit fraud. For detailed identification methods, refer to Determining Authenticity.
Points to Confirm When Purchasing Old Coins
The critical point when purchasing old coins is selecting a trustworthy source. Specifically, purchasing from Japan Numismatic Dealers Association (JNDA) member stores ensures safety. These member stores undergo strict scrutiny, and even if a counterfeit is sold, rules for returns and compensation are in place, providing reassurance for collectors.
Also effective is choosing items graded by international third-party authentication agencies like PCGS or NGC. These institutions conduct authenticity appraisals under strict standards and seal items in plastic cases with guarantees. By verifying the serial number of the certificate online, the authenticity can be proven, ensuring the value and reliability of the purchased items. Refer to Guide to Obtaining and Purchasing Old Coins to establish safe purchasing routes.
Conversely, caution is needed with person-to-person transactions through online auctions. Many sales lack authenticity guarantees, making negotiations over returns or compensation difficult. When purchasing high-value items, it is wise to seek multiple expert opinions, suspect any items with unknown origins, or those priced significantly below market value as possible counterfeits, and proceed with caution. Gathering sufficient information and careful consideration before purchasing is the best strategy to avoid fraud.
Should counterfeit items be purchased, swift and calm action is required. Request a guarantee of authenticity from the seller, and prepare to present purchase exchanges and appraisal results. If purchased from a JNDA member store, consultation with the association can enable return or compensation negotiations. For difficult negotiations after purchasing from an individual, consider consulting the consumer center or utilizing small claims court. Selling items identified as counterfeit to others causes further damage and should be strictly avoided. Address the issue calmly and proceed with appropriate procedures.
Importance of Fundamentals in Coin Authentication
To detect counterfeit old coins, the most basic and essential tasks are the precise measurement of weight and dimensions and detailed surface observation. Mastering these basics builds the foundational skill of authenticity judgment. Utilizing the "three-point set" of a precision scale, caliper, and a loupe magnifying 10 to 20 times ensures that minute differences are not overlooked. These tools can be assembled for approximately ¥5,000 to ¥10,000 and are valuable for everyday observation.
Choosing a reliable source and ongoing learning are also indispensable. Observing the inventory of museums and trustworthy dealers and experiencing the genuine texture and weight enhances authenticity judgment skills. Additionally, using reference books is crucial. By acquiring basic knowledge with publications like the "Japanese Currency Catalogue" or specialized books for each coin type, the foundation for sharpening appraisal skills is built.
Online resources are also effective. By utilizing the image databases of PCGS and NGC and repeatedly comparing images of certified items, online authenticity judgment ability is improved. Furthermore, referencing Practical Guide to Coin Grading allows for further knowledge accumulation.
Moreover, participating in numismatic study groups and sales events is highly beneficial as practical learning venues. Direct learning opportunities from veteran collectors and dealers are invaluable, providing a chance to resolve questions on the spot.
Records show that consistently applying such fundamental methods significantly enhances the ability to identify counterfeits. By firmly mastering these fundamentals, the accuracy of coin authentication improves steadily.