BBC:
A rare stamp worth as much as $200,000 (£105,000) may be on an envelope sealed in a ballot box after the US mid-term elections, poll officials say.
Officials in Broward County, Florida, say they saw a famous "Inverted Jenny" stamp while reviewing postal ballots.
About 700 of the stamps were mistakenly printed in 1918 with an upside down illustration. Just 100 went on sale.
But it will be 22 months before laws will permit the box with the envelope to be reopened and the stamp checked.
