Article by:

Christopher Frank
CTF Error Coins

Features

Mushroom Error Coins

indentA favorite of error coin collectors are the eye appealing mushroom error coins, which, as the name suggests, have the shape of a mushroom. These coins are larger than a normal size coin with some examples that have expanded to a huge size.

indentMushroom error coins are created by two blank planchets being struck together, struck coins that are struck together with a blank planchet, or a coin or planchet struck with a previously struck coin resulting in an indent or brockage. The extra pressure from two coins being struck at the same time expands the coin outward resulting in a broadstruck strike. A mushroom coin will have a cracked planchet in two spots. You can also find mushroom error coins as a result of die caps and mated pairs. Technically, all mushroom coins are part of a mated pair. Mushroom errors always have a least two coins involved and sometimes three or more.

indentA mushroom coin that is formed from being struck with a blank planchet is called an indent. The indent will not have any detail showing unless the coin being indented was previously struck, resulting in a distorted image. A mushroom coin struck with a previously stuck coin will result in a brockage or impression of the struck coin into the mushroom coin.

indentNickels make the best mushroom coins because of their thickness. They tend to expand out nicely with the extra pressure when two thick planchets are struck together. 1964 was a banner year for huge mushroom nickels. While many of these coins are dated, some are not. Most of the coins from this year have the same look to them. Mushroom error coins seem to get rarer the higher in the denomination you go.

indentKeep an eye out for these very eye appealing coins. Many error coin collectors will collect multiple examples of the impressive mushroom error coin. Find us on Instagram at ctf_error_coins or via our website at ctferrorcoins.com.

1965 PCGS MS65RD Large Mushroom
60% Brockage Broadstruck Cent Mint Error Wow!

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2000 NGC MS67RD Double Struck Indent
Mushroom Cent Mint Error Dated 2,000,000

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ANACS MS64 RED Mushroom Broadstruck Thru Capped Die
Lincoln Cent Mint Error Wow

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2000 NGC MS66RD Large Mushroom Broadstruck Indent
Lincoln Cent Mint Error Wow!

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1964 NGC MS65 Huge Mushroom Broadstruck
Brocakage Nickel Mint Error

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1998 PCGS MS64 Huge Mushroom Broadstruck Brockage
Nickel Mint Error Eye Appeal

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1964 ANACS MS 63 Reverse Die Cap Mushroom
Nickel Mint Error Great Eye Appeal

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PCGS MS65 Huge Mushroom Double Struck Broadstruck
Cracked Plan Nickel Mint Error

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NGC MS67 Massive Mushroom Double Struck
Broadstruck Brockage Nickel Mint Error

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1995 NGC MS66 Two Coin Set Mated Pair
Nickel Mint Errors with Mushroom Strike

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1964 NGC MS63 Huge Silver Mushroom
Broadstruck Indent Dime Mint Error Amazing!!!

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1996 PCGS MS66 Large Mushroom 40% Brockage
Broadstruck Dime Mint Error

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2000 ANACS MS63 Mushroom Broadstruck Indent
New Hampshire Quarter Mint Error

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2007 D PCGS MS64 Multi Struck Broadstruck
Partial Planchet Wyoming Quarter Mushroom Error

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