How can you tell a cast fake ancient coin from a struck counterfeit? Cast counterfeits may show mold seams, casting pits, softened detail, or sprue-removal m...

An ancient coin overstrike was made by striking new dies onto an existing coin instead of a fresh blank. Learn how to recognize traces of the undertype, why ...

A plate coin is a specific specimen illustrated in a numismatic reference, scholarly publication, museum catalog, or auction catalog. Learn where the term co...

What is a fourrée? Learn how ancient plated counterfeit and unofficial coins were made, how their base-metal cores can be identified, what subaeratus means, ...

Learn how to read an ancient coin auction listing: metal abbreviations such as AR and AE, weight and diameter, die axis, catalog references, condition notes,...

Ancient coin references such as RIC, RPC, Sear, HGC, BMC, SNG, and RSC are catalog citations used to identify and compare coin types. Learn what each abbrevi...

A flan is the blank piece of metal used to strike an ancient coin, also called a coin blank or planchet. Learn how ancient flans were prepared, why their siz...

Horn silver is the numismatic term for silver chloride corrosion products that can form on ancient silver coins in chloride-rich environments, especially dur...

Die wear develops as engraved coin dies lose sharpness through repeated use, causing newly struck ancient coins to show soft or rounded detail even before ci...

Countermarks are secondary stamps added to ancient coins after they were originally struck. Learn why governments, cities, military authorities, and other au...

Test cuts are deliberate post-mint cuts made into ancient coins, especially silver, often interpreted as attempts to inspect the metal beneath the surface. L...

Banker's marks are small post-mint punches or stamps found on some ancient coins, especially widely circulated Greek silver. They are often interpreted as ma...

Eye appeal is the overall visual impression an ancient coin makes, shaped by artistry, centering, strike, surfaces, patina, toning, and balance. It is subjec...

What does “brushed” mean on an ancient coin? The term describes visible evidence of brushing during cleaning or conservation, but the notation alone does not...

What does “smoothed” mean on an ancient coin? Smoothing is a post-mint mechanical alteration that reduces surface roughness and differs from ordinary cleanin...

You've seen the word "tooled" in a coin description and wondered: what does it mean? Is the coin fake? Tooling is one of the most misunderstood subjects in a...

How do collectors evaluate an ancient coin? Look beyond grade alone. This guide shows how experienced collectors weigh strike, centering, surfaces, style, pa...

Ancient coins were struck by hand, so off-center designs, irregular flans, weak areas, die wear, double strikes and edge cracks are often normal results of a...

Learn how to store ancient coins safely for the long term, including PVC-free holders, humidity control, careful handling, slabs, flips, capsules, trays, rec...

Should you buy ancient coin group lots? Group lots can be excellent for learning attribution and handling many real coins, but low cost per coin can hide dup...

Should you buy ancient coins on eBay? You can find genuine ancient coins and reputable specialist dealers there, but beginners should evaluate the seller as ...

Should you buy certified or raw ancient coins? Certified coins add third-party attribution, grading, encapsulation and an expert opinion on genuineness; raw ...

How does ancient coin authentication work? Learn how specialists build an evidence-based opinion using die studies, style, weight, metal, manufacturing techn...

Bronze disease is active chloride-driven corrosion that can damage ancient copper-alloy coins if moisture keeps the reaction going. Learn how to distinguish ...