San Francisco Wreck

The final voyage

Dealer and auction listings place the "San Francisco" off Santiago Island in the Cape Verde archipelago around 1650, describing the vessel by turns as an unidentified Spanish ship under a Portuguese captain or as a Spanish slaving vessel. The two descriptions do not agree with one another, and no primary Spanish or Portuguese archival casualty record, excavation report, or named salvor has been located to reconcile them. The name is also shared with at least two unrelated, better-documented ships — a Manila galleon lost off Japan in 1609 and a member of the 1733 Nueva España fleet wrecked in the Florida Keys — which has likely contributed to confusion in trade literature.

What can be assessed is the coinage itself. Material sold under the San Francisco name runs from Potosí cobs struck under Philip II in the 1580s through Mexico City and Potosí issues of Philip IV into the 1640s, a span consistent with older silver still circulating at a mid-17th-century loss. The pieces are overwhelmingly 8 reales and typically show the porosity, pitting, and dark patina associated with long seawater immersion, which is why they are conventionally graded with "Sea Salvaged" details designations rather than standard numeric grades.

What was aboard

No manifest, salvage report, or archival casualty record for this vessel has been located. What follows describes the coinage sold under the name, not a documented cargo.

Potosí 8 reales: Cobs of Philip II through Philip IV struck at the Potosí mint, the mainstay of material sold under this name.

Mexico City 8 reales: A smaller share of coins struck at the Mexico City mint, generally of Philip III and Philip IV.

Shipboard fragments: Some listings include incidental artifacts (ballast stone, encrusted iron) sold alongside coins, without independent provenance.

How to collect

Treat the name as a label: "San Francisco" should be understood as a market pedigree for a coin type and date range, not as proof of a specific identified vessel.

Grade on the coin, not the story: Mint, assayer, monarch, weight, and the physical evidence of sea exposure are verifiable; the vessel identity generally is not.

Don't conflate the name: Confirm which "San Francisco" is meant — this Cape Verde attribution is unrelated to the 1609 Manila galleon or the 1733 Nueva España fleet ship of the same name.

Expect details grading: Certified examples typically carry "Sea Salvaged" details rather than numeric grades; that convention reflects condition, not confirmed shipwreck provenance.