Lamination Coin Errors: Metal Separation and Flaking

Lamination errors occur when impurities, gas pockets, or contamination in the coin metal cause it to separate into layers. The resulting defects range from small surface flakes to dramatic peeling and even complete planchet splitting. Lamination errors originate during planchet preparation — before the coin is ever struck — making them distinct from striking or die errors.

What This Means

Coin metal must be uniform and properly bonded throughout its thickness. When the alloy contains impurities, trapped gas, or foreign material inclusions, the layers of metal don't bond properly. These weak spots can manifest before, during, or after striking.

What to Look For

• Flaking or peeling metal — thin sheets lifting from the surface
• Blistering — raised bubbles from trapped gas beneath the surface
• Missing lamination — a recessed area where a flake has broken off
• Split planchet — severe separation where the coin has split nearly in half
• Concentric cracking around the edges of a separation
• Rough, porous texture beneath a missing flake

Common Mistakes to Avoid

• Confusing corrosion or verdigris with lamination errors
• Assuming all flaking is a lamination — environmental damage can cause similar appearance
• Not examining the separated area for clean metal layers
• Removing lamination flakes that are still partially attached — leave them in place
• Confusing bubbling from heat damage with genuine lamination blisters

What Affects Value

Lamination values depend on severity — small flakes carry minimal premiums, while dramatic peeling, split planchets, or large missing areas are more collectible. Clean, well-preserved examples with clear lamination characteristics are preferred.