July 3rd, 2010

Earliest Known Use

Earliest Known Use

Posted on 03 Jul 2010 at 12:43am

The cover or piece that documents the earliest date on which a stamp or postal stationery item is known to be used. New discoveries can change an established Earliest Known Use (EKU).

The EKU for a classic issue may be after the official issue date. Because of accidental early sales, the EKU for modern stamps is often several days before the official first day.

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