Robert A Siegel will offer a rare block of four 1868 5c F-Grill stamps in its July 26-27 United States and Possessions auction in New York.
 The grilled issue features indentations designed to stop reuse |
The grilled issue is so named for the indented pattern included on the stamps to stop people reusing them by washing off the cancellation.
The patterns vary and are given letters to distinguish them (hence "F-Grill").
Very few blocks survive. This example is valued at around $17,000.
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