1999 D New Jersey Error ANACS MS-64 Quadruple Clip

Look at the illustration below and follow the progress of each punched row in numerical order. This is how quad clips happen, to my understanding. Sometimes the machine fouls and backs up, punches rows over too far, too close together, etc. Many clipped blanks are weeded out at the press, but some make it through.

aha a double offset in the blanking process, I should have been able to figure that one out

Very cool.

Now that I see the diagram, I bet what I remember reading was that there can't be more than 2 straight clips which would make sense on the corner of the sheet.

The maximum number of curved clips I've seen on a U.S. coin is five. The maximum number of curved clips I've seen on a world coin is six. I've heard tell of State Quarter with seven clips, but I'm skeptical.

It's clear multiple curved clips are produced in a manner somewhat different from that implied by the diagram reproduced by coppercoins. The spacing never matches that of conventionally-punched strip no matter how you move it around. I've never quite understood it, but some cases probably involve oddly-spaced holes that are punched over again.

OK Chuck, draw us some pictures.