Double Struck Coin Errors Guide
Double struck errors occur when a coin receives two or more impressions from the dies, typically because the coin failed to eject from the press after the first strike. The second strike can be perfectly centered over the first (in-collar) or offset at various angles, creating dramatic overlapping designs. These are among the most visually striking mint errors.
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Double Struck In-Collar
The coin received two strikes while remaining in the collar die. The second impression overlaps the first, creating a slightly blurred or shelf-like appearance.
How to check: The design appears slightly doubled or blurred overall, but the coin retains its normal diameter and reeding. Compare with a normal coin to see the subtle doubling.
$25 - $200Double Struck Off-Center (Rotated)
After the first strike, the coin shifted or rotated before receiving a second impression. Two overlapping designs are clearly visible at different angles.
How to check: Two distinct impressions of the design will be visible, rotated relative to each other. The greater the rotation, the more dramatic and valuable the error.
$100 - $2,000+Double Struck with Flip
The coin flipped over between strikes, showing obverse and reverse designs overlapping on both sides.
How to check: Both sides will show elements of both the obverse and reverse designs superimposed on each other.
$200 - $3,000+Multi-Struck (Three or More)
The coin received three or more strikes, creating increasingly distorted and dramatic overlapping impressions.
How to check: Multiple overlapping design impressions visible, often with significant distortion and spreading of the planchet.
$200 - $5,000+Double Struck on Previously Struck Coin
A finished coin from a different denomination re-entered the press and was struck again with different dies.
How to check: Elements of two different coin designs are visible, with the second strike partially obliterating the first.
$500 - $5,000+Quick Checks
- Look for two overlapping impressions of the same design at different angles
- Check if both sides show mixed obverse and reverse elements (flip-over double strike)
- In-collar double strikes appear as slight overall blurriness — compare to a normal coin
- More dramatic offset and rotation equals higher value
- Multi-struck coins will be visibly distorted and expanded
Frequently Asked Questions
What causes double struck errors?
Double strikes occur when a coin fails to eject from the press after the first strike and receives a second impression. This can happen due to mechanical failure, incorrect ejection timing, or the coin becoming stuck between the dies.
How valuable are double struck coins?
Values range from $25 for in-collar double strikes to $5,000+ for dramatic multi-struck or flip-over errors. The key factors are how dramatic the offset is, whether the date is visible, and the denomination of the coin.
How do I tell a double struck coin from a doubled die?
A double struck coin shows two complete impressions of the entire design, often at different angles. A doubled die shows consistent doubling on specific design elements from a single strike using a defective die. Double strikes affect one coin; doubled dies affect all coins from that die.
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