How to Check a Coin for Errors: Complete Examination Routine

Checking a coin for errors is a systematic process that gets faster and more effective with practice. This guide walks you through the complete examination routine used by experienced error hunters — from the tools you need to the step-by-step process for examining every part of a coin.

What This Means

A thorough coin error check examines every area of the coin where manufacturing defects can appear: obverse and reverse surfaces, the rim, the edge, and physical characteristics like weight and diameter. A consistent routine ensures nothing is overlooked.

What to Look For

• Step 1: Overall impression — does anything look unusual at first glance?
• Step 2: Obverse — check date, LIBERTY, IN GOD WE TRUST, and portrait for doubling, cracks
• Step 3: Reverse — check design, motto, and denomination text for the same
• Step 4: Rim — look for cuds, clips, die cracks extending from rim, finning
• Step 5: Edge — verify proper reeding (dimes, quarters, halves), check for partial collar
• Step 6: Flip test — check obverse-to-reverse alignment for rotated die
• Step 7: Weight — if anything seems off, weigh the coin

Common Mistakes to Avoid

• Skipping steps in the examination routine
• Not using adequate magnification for subtle errors
• Examining in poor lighting conditions
• Only checking one side of the coin
• Rushing through coins too quickly
• Not keeping notes on interesting finds for further research

What Affects Value

The thoroughness of your examination directly affects your finding rate. Rushing through coins means missing subtle errors. Developing a consistent, efficient routine lets you check coins thoroughly without spending excessive time on each one.