Florida treasure hunters found a trove of $4.5 million worth of Spanish gold coins 300 years to the day after a fleet of ships sank in a hurricane while en route from Havana to Spain, the salvage owner said Wednesday.

The 350 coins found on July 30 include nine rare pieces, known as royal eight escudos, which were being transported to the King of Spain, according to Brent Brisben. His company, 1715 Fleet — Queens Jewels, owns the rights to the wreckage.

Only 20 such coins were known to exist prior to the recovery of the nine royals, Brisben said.