This case brief covers New Jersey Appellate Division allows rescission for mutual mistake where both parties believed a rare coin was genuine but it was counterfeit.
Beachcomber Coins, Inc. v. Boskett is a leading mutual mistake case frequently taught in Contracts courses to illustrate how courts handle bargains formed under a shared, erroneous assumption about the very nature of the thing being sold. Unlike cases involving mere misjudgments of market value, Beachcomber emphasizes that an error as to authenticity or identity strikes at the essence of the exchange and can justify unwinding the deal.
The opinion is also significant for its treatment of risk allocation. The court rejects the notion that a buyer’s expertise, diligence, or opportunity to inspect automatically shifts the risk of mistake. Instead, the decision applies the Restatement approach—permitting rescission when there is a basic, mutual mistake with a material effect, unless the affected party assumed the risk by agreement, conscious ignorance, or other allocation. The case is a staple for demonstrating the line between mistakes of value and mistakes as to the identity of the subject matter and for showing how courts structure rescission and restitution remedies.
166 N.J. Super. 442 (App. Div. 1979), 400 A.2d 78
Plaintiff Beachcomber Coins, Inc., a professional coin dealer, purchased from defendant Boskett, a non-merchant seller, a 1916-D Mercury dime—a highly collectible and valuable coin—after both parties examined it and agreed it was genuine. The parties used customary methods of inspection, including magnification and reference to known diagnostic features; both believed in good faith that the coin was authentic. Relying on that shared belief, Beachcomber paid approximately $500 for the dime. Shortly thereafter, upon further expert evaluation, the coin was determined to be counterfeit (the added "D" mint mark was not original). Beachcomber promptly tendered return of the coin and sought rescission and restitution of the price. The trial court denied relief, effectively concluding that the buyer, as an expert who inspected the coin, bore the risk of mistake. Beachcomber appealed.
Whether a buyer may rescind a contract for the sale of a coin on grounds of mutual mistake when both parties believed the coin was genuine but it was in fact counterfeit, and whether the buyer’s status as an expert and opportunity to inspect shifted the risk of that mistake to the buyer.
A contract is voidable for mutual mistake when (1) both parties were mistaken at the time of contracting as to a basic assumption on which the contract was made, and (2) the mistake has a material effect on the agreed exchange of performances, unless (3) the adversely affected party bears the risk of the mistake. A party bears the risk if: (a) the risk is allocated to that party by agreement, (b) the party is aware at the time of contracting that they have only limited knowledge with respect to the facts but treats that limited knowledge as sufficient (conscious ignorance), or (c) the court finds it reasonable to allocate the risk to that party under the circumstances. See Restatement (Second) of Contracts §§ 152, 154. A mistake as to authenticity or identity of the subject matter is a mistake as to a basic assumption, not merely a mistake in value.
Reversed and remanded with directions to grant rescission. The counterfeit nature of the coin constituted a mutual mistake as to a basic assumption that materially affected the exchange; the buyer did not, by virtue of expertise or inspection, assume the risk. The buyer was entitled to rescission and restitution of the purchase price upon return of the coin.
The court characterized the parties’ common belief in the coin’s authenticity as a basic assumption that went to the very essence of the bargain. A genuine 1916-D Mercury dime and a counterfeit dime are not the same thing; authenticity is not merely a factor influencing price, but a defining attribute of the subject matter. Because the mistake concerned identity/authenticity rather than mere value or quality, it met the threshold for mutual mistake. The mistake had a material effect on the exchange: the consideration paid for an authentic, rare coin was grossly disproportionate to the value of a counterfeit coin. Consequently, unless the buyer bore the risk, rescission was appropriate. The court found no contractual allocation of risk (no "as is" clause, no disclaimer, and no express assumption of risk by the buyer). Nor did the buyer proceed in conscious ignorance—both parties believed, after reasonable inspection, that the coin was genuine. The buyer’s expertise and the opportunity to inspect, standing alone, did not shift the risk to the buyer; the law of mutual mistake does not penalize diligence by converting expert inspection into a risk-allocation mechanism absent agreement or conscious gambles on uncertainty. The court distinguished cases involving mistakes in market value from those involving authenticity. It aligned with precedents (e.g., cases involving counterfeit art or misattributed instruments) that permit rescission when both parties are wrong about the identity of the thing sold. Finally, permitting rescission serves equitable principles by restoring the parties to their pre-contract positions without rewarding either side for an innocent, material error about the subject matter’s authenticity.
Beachcomber Coins is frequently cited in Contracts to clarify the mutual mistake doctrine: errors about authenticity/identity are qualitatively different from errors about value. It illustrates the Restatement framework for determining when rescission is available and shows that expertise, inspection, and even negligence do not alone bar relief where there is no risk allocation. For students, it is a touchstone for issue-spotting the distinction between value versus identity mistakes, analyzing material effect, and applying the three pathways by which risk can be allocated to defeat rescission.
A mistake of identity or authenticity concerns the very nature of the thing being bought (e.g., whether a coin is genuine). A mistake of value is merely a misjudgment of how much a known item is worth. Beachcomber holds that authenticity is a basic assumption underlying the contract; when it is mistaken, the contract is voidable for mutual mistake. By contrast, mere misestimations of value typically do not justify rescission.
No. Beachcomber rejects the idea that expertise or inspection alone reallocates risk. Under Restatement §154, risk shifts by agreement, conscious ignorance, or court allocation. Without an "as is" clause, explicit assumption of risk, or facts showing the buyer knowingly gambled on uncertainty, an expert buyer may still rescind for mutual mistake.
Rescission with restitution. The court ordered the contract unwound and the price returned upon the buyer’s tender of the counterfeit coin. Because the parties were innocently mistaken about a basic assumption and the mistake materially affected the exchange, equity warranted restoring the status quo ante rather than enforcing a bargain neither party actually intended.
An "as is" clause or express allocation of risk to the buyer would likely foreclose rescission. Under Restatement §154(a), if the contract allocates the risk of mistake to a party, that party cannot avoid the contract for mutual mistake. Many courts treat clear "as is" language as allocating the risk of unknown defects, including authenticity, to the buyer.
No. Depending on the facts, a buyer may pursue remedies for breach of express or implied warranties (e.g., a description that the coin is a genuine 1916-D may create an express warranty by description under UCC §2-313) or seek revocation of acceptance under UCC §2-608 if the nonconformity substantially impairs value. Beachcomber, however, proceeded on mutual mistake because there was no actionable misrepresentation or agreed-upon warranty, and both parties were innocently mistaken.
Yes. That scenario implicates unilateral mistake with potential fraud or misrepresentation. The buyer could seek rescission and damages on misrepresentation or warranty theories, and the court would not need to rely on mutual mistake, which requires that both parties share the same erroneous assumption.
Beachcomber Coins v. Boskett stands for the proposition that when both parties contract under a shared, fundamental misapprehension about the identity or authenticity of the subject matter, equity permits unwinding the transaction. The case confirms that such errors are not mere valuation problems; they are foundational mistakes that materially alter the exchange.
For students and practitioners, the decision is a clear roadmap for analyzing mutual mistake: identify the basic assumption, assess material effect, and determine whether risk was allocated by agreement, conscious ignorance, or judicial allocation. Absent such allocation, rescission with restitution is an appropriate remedy to restore the parties to the status quo ante.