Authentication Is a Collector's Most Important Skill

Counterfeit coins fall into two categories: contemporary counterfeits made to spend as money during their era (which are actually collectible historical artifacts), and numismatic counterfeits made to deceive modern collectors. Understanding both is essential.

The Quick Authentication Checklist

Weight: A precision scale ($20-50) catches a significant percentage of fakes. Keep a reference chart of standard weights for your denominations.
Magnetic test: Genuine U.S. gold and silver coins are non-magnetic. A rare earth magnet detects ferrous core metals in many counterfeits.
Edge examination: Genuine reeded edges show uniform, evenly spaced reeding. Counterfeit reeding is uneven or shows file marks. Cast fakes show a seam line.
Surface texture: Genuine coins show smooth flow lines and cartwheel luster. Cast counterfeits show surface porosity. Die-struck fakes may have unnaturally sharp or tooled features.

Famous Counterfeits to Know

Henning Nickels — 500,000 counterfeit Jefferson nickels produced in the 1950s. The 1944 Henning nickel lacks the large wartime mint mark. Now collected as historical curiosities.
Omega Morgan Dollars — A prolific family identified by a tiny omega-shaped mark. Targets high-value dates like 1893-S and 1889-CC.
Chinese mass-produced fakes — Since the 2000s, factories have produced millions of counterfeits covering virtually every denomination and date. The most significant threat to modern collectors.

The Golden Rule

For any coin with significant value, buy it certified by PCGS or NGC. The grading fee is negligible compared to the risk. Never buy expensive raw coins from unknown sellers. When in doubt, don't buy.

Discussion

Have you ever been burned by a counterfeit purchase? What tipped you off?
What authentication tools do you use regularly — scale, magnet, loupe, other?
Do you collect contemporary counterfeits (like Henning nickels) as historical artifacts?
What's the most convincing fake you've encountered?

Counterfeits

Detecting Counterfeits: Protect Your Collection