mintmark

Counterfeit Mintmarks: How to Spot Altered Coins Before You Buy

Collecting Strategies CoinWeek - May 4, 2026

A mintmark can change a coin’s value in an instant. In some cases, one small letter turns a common coin into a four-figure rarity....

1913-S Indian Head Half Eagle with "Blob" Mintmark

The Mystery of the “Blob” Mintmark on the 1913-S Indian Head Half Eagle

US Coins Roger W. Burdette - December 18, 2025

By Roger W. Burdette for CoinWeek Collectors of Indian Head half eagles cherish a quintet of San Francisco Mint coins for their overall rarity. These...

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Counterfeit Mintmarks: How to Spot Altered Coins Before You Buy

The Mystery of the “Blob” Mintmark on the 1913-S Indian Head Half Eagle

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