An extremely old, rare and valuable map of California is going up for sale next week.
The map was drawn and signed almost exactly 252 years ago by a Spanish explorer named Miguel Costanso. The original manuscript map of coastal California is estimated to be worth between $600,000 and $800,000 by Bonhams, the auction house selling the relic in New York.
In a statement shared with SFGATE the auctioneers characterize the item as"the most important 18th century map of California." As part of the historic Portola expedition — the first time European settlers set foot in California — Costanso acted as an engineer while on land, and a cartographer at sea. The map, drawn in Mexico and signed by Costano on Oct. 30, 1770 details the inlets of the bay and North Bay, and alongside San Francisco, also names Point Reyes and the Farallones. Bonhams says the previous map drawn from the same expedition did not include the Bay Area.
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