74-D 40% silver Ikes estimates 30 this variety was discovered by a Las Vegas blackjack dealer.
1974 D 1$ Mint Error Struck on a 40% silver clad planchet NGC MS64
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Description
When the SFAO started striking copper-nickel clad dollars in 1973, all of the planchets rejected as unfit for Proof coinage were placed in barrels, and when they finally had enough barrels to fill up a semi they shipped them to Denver to be struck as circulation dollars. Some 40% planchets got mixed in by error.
