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It may be a Mint error only in that the coin is an uneven thickness, in which case it would be a planchet error. If the coin is not damaged otherwise (excluding the bubble), though, then it's probably not a provable Mint error. The bubble is probably a lamination problem, which can also be a planchet error. This occurs when the cupro-nickel layer (the "silver" colored layer) separates from the copper middle.

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โˆ™ 2007-02-27 17:52:21
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Q: Is a 1984-S quarter with a bubble on the obverse and is thicker at the top a mint error?
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