World Gold Coins & Karat Specifications
Browse sovereign gold issues, trade ducats, and modern bullion coins with verified gram weights, karat purities (.900 to .9999), and Krause KM# numbers.
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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.
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.
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