Identifying Unknown Foreign Coins

Solving the Mystery Coin

Every collector encounters them — mysterious foreign coins found in pocket change, inherited collections, travel souvenirs, or coin show bargain bins. The coin has unfamiliar writing, unknown symbols, and no obvious date in Western numerals. How do you identify it? This guide provides a systematic approach to identifying unknown foreign coins using visual clues, online resources, and reference materials that will turn mystery coins into identified treasures.

Step 1: Identify the Script

The writing system on a coin is often the fastest path to identification. Common scripts found on coins:

• Latin alphabet: Most European, American, and many former colonial nations. If you can read the letters, search for the country name in the legend.
• Cyrillic (АБВГД): Russia, Soviet Union, Serbia, Bulgaria, Ukraine, Mongolia. Look for "CCCP" (Soviet Union) or "РОССИЯ" (Russia).
• Arabic (right-to-left flowing script): Middle Eastern and North African countries, plus historical Ottoman and Islamic coinages. Many modern Arabic coins also include Western numerals for the date.
• Chinese characters (漢字): China, Taiwan, older Japanese and Korean coins. Look for "中華民國" (Republic of China/Taiwan) or "中华人民共和国" (People's Republic of China).
• Devanagari (हिन्दी): India, Nepal. Look for "भारत" (India) or the Ashoka Lion symbol.
• Thai (ภาษาไทย): Thailand — distinctive looping script. Look for the Thai king's portrait.
• Korean Hangul (한글): South Korea, North Korea. Distinctive block-shaped characters.
• Greek (ΑΒΓΔ): Greece and Cyprus. Modern Greek coins often include "ΕΛΛΑΣ" or "ΕΛΛΗΝΙΚΗ ΔΗΜΟΚΡΑΤΙΑ."
• Hebrew (עברית): Israel. Right-to-left script, look for the menorah symbol.

If the script is completely unfamiliar, take a clear photo and use Google Lens or similar visual search tools — these can often identify the language and sometimes the specific coin.

Step 2: Look for Visual Clues

Even without reading the legend, visual elements narrow the identification:

• Coat of arms/national emblem: Most countries place their national emblem on coins — eagles (many countries), lions (Britain, various), harps (Ireland), maple leaves (Canada), etc.
• Portraits: Monarch portraits identify British Commonwealth coins (Elizabeth II appeared on coins of 33 countries). Other portraits may be presidents, national heroes, or historical figures.
• Denomination: Even if you can't read the language, the numerical value (1, 5, 10, 25, 50, 100) helps narrow the search when combined with other clues.
• Shape: Non-round coins narrow identification — scalloped edges (Hong Kong, various), heptagonal (British 50p/20p), square (various), holed center (Japan, Denmark, various).
• Size and metal: Measure diameter and note the metal color. Compare to known coin specifications in Krause catalogs or online databases.

Step 3: Use Online Identification Tools

Several free online resources excel at coin identification:

Numista.com: The most comprehensive free coin identification database. Search by country, denomination, year, metal, or visual characteristics. The catalog includes high-quality images of virtually every modern coin type worldwide. Numista's community forum also offers free identification help for stumped collectors.

CoinIdentifier apps: Smartphone apps like Coinoscope and Google Lens use image recognition to identify coins from photos. Accuracy varies but has improved dramatically. Take clear, well-lit photos of both sides for best results.

World Coin Gallery (worldcoingallery.com): Visual reference organized by country with images of common coin types.

r/coins on Reddit: Post clear photos and the community will often identify your mystery coin within hours.

CoinTalk.com: Active forum with knowledgeable world coin collectors who enjoy identification challenges.

Step 4: Decode the Date

Not all countries use the Western (Gregorian) calendar year on their coins:

• Islamic/Hijri calendar: Used on coins from many Muslim-majority countries. The Hijri year is approximately 622 years less than the Gregorian year (Hijri 1447 ≈ 2025/2026 AD). Some coins show both dates.
• Buddhist Era: Used on Thai coins. Add 543 to convert: BE 2569 = 2026 AD.
• Japanese regnal years: Dated by emperor's reign. Reiwa 8 = 2026 AD.
• Ethiopian calendar: Approximately 7–8 years behind the Gregorian calendar.
• Solar Hijri: Used on Iranian coins. Different calculation from the standard Hijri calendar.

Step 5: Determine Value

Once identified, determine the coin's approximate value:

• Numista.com: Provides estimated values by grade for most world coins
• Krause catalog: The standard pricing reference for world coins
• eBay sold listings: Search for the specific coin to see recent actual selling prices
• NGC/PCGS price guides: For certified world coins

Most mystery coins found in pocket change or bargain bins are worth face value or modest collector premiums. But occasionally, a coin that looks ordinary turns out to be a scarce date, error, or unusual type worth considerably more. The identification process itself is rewarding — every mystery solved adds to your numismatic knowledge and makes you better at spotting interesting coins at coin shows and in dealer inventories.