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Improper Alloy Mixture Mint Error

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Improper alloy mixture is when two or more alloys that make up the coil stock that planchets are punched out of do not properly mix and this creates a “wood” grain effect of the metal. Coins that display this wood grain appearance are affectionately called “Woodies”.

Values on these tend be in the $10 range for cents and climb as the denomination increases but other factors can come into play on value and that is the grade assigned, date and mint and eye appeal.
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Image courtesy of Heritage Auctions