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What a planchet is (and why error collectors care)
A planchet is the blank piece of metal a mint strikes into a coin. Wrong planchets and clipped planchets are real errors. A damaged coin is not.
A planchet is the blank.
The mint cuts it to the right size and weight, sometimes upsets a rim, then strikes it. If the blank is the wrong metal, the wrong size, or incomplete, and it still gets struck or shipped, collectors call that a planchet error.
Real vs wishful
A quarter struck on a nickel planchet is rare and collected. A blank that never got struck is collected by people who like mint process. A coin you dropped in gravel is not a planchet error.
What a mint is. Error hype. Seigniorage.
At the counter
If you think you have a wrong-metal strike, do not clean it and do not drill it. A shop that handles errors will weigh it and look at the edge. Most “wrong metal” stories are plated fakes or damage. Don’t clean. Counterfeits.
Continue in the coin and money library. Related visitor guides: for shop visitors.
Extra pad history for planchets
A planchet is the blank the mint intends to strike. Metal is rolled, blanks are cut, a rim is sometimes upset, then two dies hit the blank. What a mint is. If the blank is the wrong metal, the wrong size, or incomplete, and it still gets struck or shipped, collectors call that a planchet error. Those exist. They have books. They also have a thousand cousins that are plated fakes, damage, or a coin you dropped in gravel.
A blank that never got struck is collected by people who like mint process. It is not a “missing design error” in the Facebook sense. Error hype. Seigniorage is why mints care about the cost of the blank in the first place.
What the shop does when you think you have one
If you think you have a wrong-metal strike, do not clean it and do not drill it. We weigh it and look at the edge. Most “wrong metal” stories are plated zinc, a wash of color, or environmental damage. Don’t clean. Counterfeits of a different kind.
A quarter struck on a nickel planchet is rare and collected. A quarter with a plating bubble is a modern cent problem that people move onto the wrong denomination in their heads. Bring the coin. Leave the printout in the car if it makes you calmer. We will still look.
People also ask
Is an unstruck blank valuable? Sometimes, to process collectors. Not automatically.
Does a wrong weight prove a planchet error? It starts the question. Fakes are the wrong weight too.
Should I slab a possible wrong-planchet coin? If it survives a shop look, maybe. When to slab.
Is a clipped coin a planchet error? A genuine clip can be. A dinged rim usually is not.