Errors & Varieties
Doubled dies, off-strikes, and the rare errors worth real money.
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Errors & Varieties1955 Doubled Die Penny: Value, How to Spot It, and What It's Worth Today
The 1955 Doubled Die Obverse Lincoln Cent is the most famous doubled die in US numismatics. Catalog values, authentication checklist, and how it differs from machine doubling.
7 min read- Errors & Varieties
1943 Bronze Penny: How to Tell a Real One from the 99% That Are Fake
The 1943 bronze cent is one of the most valuable US error coins ever struck — and one of the most counterfeited. The 5-second magnet test, the weight check, and what to actually do if you have a candidate.
8 min read 
Errors & VarietiesBuffalo Nickel Key Dates and Errors Worth Looking For
The Buffalo Nickel ran from 1913 to 1938 and produced some of the most famous error coins in US numismatics. The 1937-D 3-Legged, the 1918/7-D overdate, and the 1916 doubled die — what each is actually worth, with catalog values.
8 min read
Errors & VarietiesState Quarter Errors Worth Real Money: Which Ones to Look For
Catalog values and authentication details — state quarter errors.
8 min read- Errors & Varieties
Off-Center Strike Errors: How They Happen and What They're Worth
Catalog values, history, and authentication — off center coin error.
7 min read 
Errors & VarietiesRoosevelt Dime Errors and Key Dates: What's Actually Worth Money
Catalog values and authentication details — roosevelt dime errors.
7 min read- Errors & Varieties
Repunched Mintmarks (RPM): The Hidden Variety on Common Coins
Catalog values, history, and authentication — repunched mintmark.
7 min read 
Errors & VarietiesClipped Planchet Errors: What They Are and What They're Worth
Catalog values, history, and authentication — clipped planchet error.
6 min read