1960 D Lincoln Memorial Cent (Small Date) Mint Error - Lamination

Very nice lamination! I like the almost barcode-like regularity of the pattern.

Wow! Very nice! I'd fork over some $$ for this example. I have several tubes of lamination-challenged cents--but nothing like this.

Nice! I like the straight edge of it as well.

A lamination error is caused on the stock metal. When the metal was cooling and getting rolled out to the correct thickness, a piece of debris was rolled onto the cooling metal, thus forcing it to be attached to the metal and rolling out out, making the attached piece longer. During the cutting of the blanks, or during the upset process adding the 'Proto Rim' it may have loosen a bit.

But still attached. Then when the strike happened and it was attached to the coin. So while in circulation this lamination could peel off the coin and most of the time does. But on this example it was still firmly attached. They are either loved or hated. To a person wanting a perfect coin, they are a blight. But to an error collector, they are the perfect thing in their eyes.
Sometimes the lamination issue peels off, sometimes it doesn't. Attached or peeled, they are noticed. All part of the metal rolling process. Thus considered a mint error. Not a striking error, not a die issue, but the stock material was as fault.

CoopHome: How does a lamination issue happen? Why does it peel off?