"Why is the 1868 1¢ Z Grill the rarest U.S. stamp?
In the late 1800s, officials had a real problem with stamps being illegally reused by washing away their cancels. Charles F. Steel came up with a solution – a grilling machine that ... Today, only two 1868 1¢ Z Grill stamps are known to exist. ..."
Source: mysticstamp.com
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