World Coin Catalog & Specifications
Browse world coins by country, year, metal tone, or Krause KM# number with verified gram weights, millimeter sizes, and alloy purities.
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How to Identify & Authenticate World Coins by Weight, Diameter & KM#
Every coin in the MakeCoinsRoll.com database is indexed with verified sovereign mint metrology: exact planchet mass in grams (g), diameter and edge thickness in millimeters (mm), Krause-Mishler (KM# / Y# / UC#) catalog identifiers, and millesimal silver or gold fineness. Use the specialty hub pills above to filter directly by precious metal bullion, copper-bronze circulation issues, bi-metallic ring-and-core coins, or pre-1950 historical strikes.
What Every Coin Profile Includes
Every coin record is structured with standardized physical and metallurgical parameters to assist collectors and coin roll hunters.
Exact Metric Dimensions
Verify official mint weight in grams (to 0.01 g precision), diameter in millimeters, edge thickness, and reeding or lettering profiles.
Metallurgy & Alloy Purity
Inspect complete metal compositions, bi-metallic core and ring alloys, magnetic response, and fine silver or gold bullion weight.
Krause (KM#) & Roll Links
Cross-reference international Krause catalog numbers, minting years, and open any coin directly inside our weight and roll calculators.
Master the Currencies, Heraldic Flags & Mint Capitals Behind World Coins
Sharpen your numismatic attribution skills. Practice matching ISO 4217 monetary units, national flags, seat-of-mint capitals, and sovereign country dossiers across all 6 continents.
World Currencies & ISO 4217 Matcher
Match circulating coin denominations, three-letter ISO 4217 codes, and currency symbols to their issuing nations.
World Flags & Heraldry Quiz
Identify official national flags and sovereign coats of arms struck on world coin obverses across 6 continents.
World Capital & Mint Cities Quiz
Connect sovereign states with their seats of government and historic national minting capitals.
Higher or Lower: Population & Coins
Compare nations head-to-head on demographic population size, shared land borders, and cataloged coinage volume.
Borders, Demonyms & ISO-3 Explorer
Decode classical coin demonyms (Helvetia, Hellas, Magyar), contiguous trade borders, and ISO 3166-1 alpha-3 codes.
Mystery Country 5-Clue Detective
Deduce unmarked sovereign issuers in 1 to 5 progressive clues covering population, currency, language, borders, and capital.
World Coin Catalog & Krause KM# FAQ
Standardized numismatic catalog prefixes—such as KM# (Krause-Mishler), Y# (Yeoman), and C# (Craig)—assign a unique identifier to each distinct coin type, alloy composition, and die variety issued by a country. You can enter any number (for example, KM# 102 or simply 102) directly into our catalog search bar above to inspect matching world coins.
Open Advanced Coin SearchInternational sovereign mints and grading services specify planchet mass in metric grams (to 0.01 g accuracy) and dimensions in millimeters (mm). Comparing your physical coin on a precision scale against our verified gram specifications helps detect counterfeit planchets, silver-clad transitional issues, and circulation wear.
Verify Coin Weight & PurityYes. You can either select an issuing nation from the Issuing Country filter above or visit our World Country Directory to explore complete national currency timelines, capital cities, and sovereign coin registries.
Explore Country DirectoryTo determine a coin's intrinsic bullion value, multiply its total weight in grams by its millesimal fineness (for example, .900 coin silver, .925 sterling silver, or .900 / 22K gold) to find the pure metal weight in grams, then divide by 31.1034768 grams per troy ounce. Every precious metal coin in our Silver Coins and Gold Coins specialty hubs links directly to our live Melt Value Calculator.
Many Asian and Middle Eastern coins display non-Gregorian calendar dates—including Japanese Imperial Eras (Showa, Heisei, Reiwa), Islamic Hijri (AH) years in Arabic numerals, Thai Buddhist Era (BE) dates, and Nepalese Bikram Sambat (BS) years. You can search our catalog directly by era name (such as Heisei 13, Reiwa 3, or 1437 AH) or convert any foreign inscription into a Western year using our Date Converter.
Open Foreign Coin Date ConverterAll monetary units, ISO 4217 currency codes, national flags, and mint capitals indexed in our coin catalog are integrated into our classroom-safe Geography & Numismatic Study Games. You can practice matching currencies to countries, deducing nations in 5 progressive clues, or comparing cataloged coin totals head-to-head.