Mint Errors

World’s Greatest Mint Errors Now Available Online

Errors and Varieties Mike Byers - August 2, 2026

The World’s Most Spectacular Mint Errors Are Now Free to Explore Won NLG Award for Best World Coin Book Mike Byers’ landmark reference brings the world’s...

Philippines: Spanish Colony. Ferdinand VII Mint Error - Double Struck Octavo 1820 M-F MS65 Brown NGC

Unique Double-Struck 1820 Philippines Octavo: A Tiny Manila Copper With a Big Colonial Story

World Coins Mike Byers - July 7, 2026

A Tiny 1820 Manila Copper Coin With a Huge Spanish Colonial Story An 1820 Philippines Octavo should not stop traffic. It measures only about 17...

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Mint Errors

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World’s Greatest Mint Errors Now Available Online

Unique Double-Struck 1820 Philippines Octavo: A Tiny Manila Copper With a Big Colonial Story

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