they put them in the capsule. >> the 17th century coin is maybe a $5,000 or $6,000 coin. the value increases tenfold. >> tenfold. >> i could only imagine. >> 50,000, $60,000. >> easily. >> paul revere was a silversmith. we know that. there is an engraved silver plate in here. it says i'll read the quote for everybody, the cornerstone of this building when it was found, intended for the use of legislative and executive branch of the commonwealth of massachusetts laid by exlen si samuel adams, by the most wishable paul revere on the 4th day of july 20th anniversary of american independence. we know paul revere was a silversmith. they're not sure he made this piece. he certainly placed it in there. what could it be worth if they could link it that he actually engraefed it? >> based upon examples that paul revere have sold about 5 years