The São José shipwreck
The São José was lost in 1622 off the coast of Mozambique after being attacked by English and Dutch defence ships while on a mission to deliver Francisco da Gama, great-grandson of the legendary Portuguese explorer Vasco da Gama, to reign as the Viceroy of India. On board, she carried a royal treasure of the Portuguese Empire to support trade with the East and with Portuguese outposts on the trade route.
After extensive historical research, followed by a large-area magnetometer survey in 2003 and 2004, marine archaeologists in April 2005 began the excavation and recovery of the São José off the coast of Mozambique. During excavation, 24,000 coins were recovered, but fewer than 7,200 are collecter-grade. They have been graded by the Numismatic Guaranty Corporation (NGC).