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A time capsule buried in 1795 by Paul Revere and Samuel Adams was unearthed in Boston at the Massachusetts Statehouse, possibly the oldest such U.S. artifact ever uncovered.

About the of a cigar , the copper container — green from oxidation and caked in plaster — was found in the cornerstone of the “new” statehouse on Beacon Hill, which was in 1798.

As Boston Museum of Arts Conservator Pam Hatchfield chiseled away for hours to the box, five silver coins spilled from the stone block — measures of good tossed in when the capsule was entombed by the revolutionary heroes 219 years ago, officials told the Boston . At the time, Adams was known as the governor, not a beer.

The world will have to a little longer to learn what’s inside. The museum will X- the box over the weekend and reveal its contents next .