Existing comment:
America's Most Famous Stamp Error:
In 1918, an error made on a spider press similar to this one produced the inverted Jenny -- the most famous US stamp.
No one today knows for sure how the inverted Jenny error occurred. During the second pass, an employee either reversed the plate with the central design -- or reversed the sheet of stamps. The result was an upside-down airplane. To avoid future errors, "TOP" was added to the appropriate side of each plate. |