ScienceSunday, November 15, 20261 min read

£8 coin bought at car boot sale may hide 192-year-old minting error

By TOI WORLD DESK · Via Times of India · Published by Everything Blog

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The King William IV coin features a heavily distorted center while preserving surprisingly intact outer rims and edge grooves. Researchers employed scanning electron microscopy, chemical analysis, and optical surface profilometry to map the surface, which revealed a striking height difference of 0.75 millimeters across the obverse portrait. Defects from this era were typically identified by inspectors and melted down to recover precious metals, making this preserved manufacturing anomaly remarkably unusual.

Key points

Defective British coins were routinely melted down during the 19th century, making this s…: Defective British coins were routinely melted down during the 19th century, making this surviving production error exceptionally rare.
Intense mechanical force applied under restricted conditions indicates the coin suffered…: Intense mechanical force applied under restricted conditions indicates the coin suffered an anomaly during steam-powered minting.
The intact outer rims and grooves helped scientists determine the damage occurred during…: The intact outer rims and grooves helped scientists determine the damage occurred during production rather than through standard wear.

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A badly damaged silver coin dating back to 1834 may hold clues to an unusual manufacturing accident that occurred nearly two centuries ago. What initially appeared to be an ordinary damaged antique has now become the subject of a scientific investigation, with researchers suggesting that the coin may have been crushed during the original minting process. According to a report published by ScienceDaily on November 11, 2026, the findings are based on a study by IA STUDIO published in the journal npj Heritage Science. Independent coverage by EurekAlert and Science News has also highlighted the unusual physical evidence uncovered during the investigation. The coin, a silver sixpence issued during the reign of King William IV, was discovered in an album containing assorted coins at a car boot sale in Greater Manchester, England. It had been individually marked with a price tag of £8, although the album was eventually purchased as a single lot rather than the sixpence being sold separately. What makes the discovery particularly interesting is the coin’s unusual condition. Its central sections are severely distorted, with much of…

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Key Points

Defective British coins were routinely melted down during the 19th century, making this s…: Defective British coins were routinely melted down during the 19th century, making this surviving production error exceptionally rare.
Intense mechanical force applied under restricted conditions indicates the coin suffered…: Intense mechanical force applied under restricted conditions indicates the coin suffered an anomaly during steam-powered minting.
The intact outer rims and grooves helped scientists determine the damage occurred during…: The intact outer rims and grooves helped scientists determine the damage occurred during production rather than through standard wear.

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Key Points

Defective British coins were routinely melted down during the 19th century, making this s…: Defective British coins were routinely melted down during the 19th century, making this surviving production error exceptionally rare.
Intense mechanical force applied under restricted conditions indicates the coin suffered…: Intense mechanical force applied under restricted conditions indicates the coin suffered an anomaly during steam-powered minting.
The intact outer rims and grooves helped scientists determine the damage occurred during…: The intact outer rims and grooves helped scientists determine the damage occurred during production rather than through standard wear.

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£8 coin bought at car boot sale may hide 192-year-old minting error

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