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THE MOST IMPORTANT 18TH-CENTURY MAP OF CALIFORNIA. COSTANSÓ, MIGUEL DE. 1741-1814. Original Manuscript Map of Coastal California Signed ("Miguel de Costansó"), Carta Reducida del Occeano Asiatico ó Mar del Sur..., produced in conjunction with the Portola and Serra expedition, image 1
THE MOST IMPORTANT 18TH-CENTURY MAP OF CALIFORNIA. COSTANSÓ, MIGUEL DE. 1741-1814. Original Manuscript Map of Coastal California Signed ("Miguel de Costansó"), Carta Reducida del Occeano Asiatico ó Mar del Sur..., produced in conjunction with the Portola and Serra expedition, image 2
Americana
Lot 12

THE MOST IMPORTANT 18TH-CENTURY MAP OF CALIFORNIA.
COSTANSÓ, MIGUEL DE. 1741-1814.
Original Manuscript Map of Coastal California Signed ("Miguel de Costansó"), Carta Reducida del Occeano Asiatico ó Mar del Sur..., produced in conjunction with the Portola and Serra expedition,

25 October 2022, 10:00 EDT
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THE MOST IMPORTANT 18TH-CENTURY MAP OF CALIFORNIA.

COSTANSÓ, MIGUEL DE. 1741-1814. Original Manuscript Map of Coastal California Signed ("Miguel de Costansó"), Carta Reducida del Occeano Asiatico ó Mar del Sur..., produced in conjunction with the Portola and Serra expedition, 835 x 835 mm, on four conjoined sheets, signed by Costansó beneath manuscript title and description, and dated Mexico, October 30, 1770, Strasbourg Bend watermark, shield with two diagonal bands mounted by a fleur-de-lis, with countermark "IV" (See Heawood 73 and 78, Churchill 437), traces of slight wear at folds and tears carefully repaired without significant loss.
Provenance: Sold Atlases, Travel, and Topography, Sotheby's, London, May 3, 1985, lot 386.

VERY RARE ORIGINAL MANUSCRIPT MAP OF COASTAL CALIFORNIA SIGNED BY MIGUEL COSTANSÓ—THE MOST IMPORTANT 18TH-CENTURY MAP OF CALIFORNIA, AND THE FIRST TO DEPICT SAN FRANCISCO BAY. In 1769, Gaspar de Portola, Father Junipero Serra, and Miguel de Costansó gathered in San Diego marking the beginning of the Sacred Expedition. The first European exploration of the Californias created the Mission system, and this enormously important map marks the beginning of the Spanish settlement of California. Costansó was the engineer for the Portola Expedition, creating the first land based maps of the California coastline, and—importantly—discovering and mapping the port of San Francisco for the first time.

The map exists in three versions: an early version in manuscript, not showing San Francisco Bay; this version in manuscript, showing San Francisco Bay for the first time; and the 1771 printed map produced in Spain from this version. The map was created in conjunction with Costansó's written report of the expedition, published in 1771 as Diario Historico de los viages de mar, y tierra hechos al norte de la California, the first book on California and itself a rarity. George Hammond of the Bancroft Library notes in his introduction to Noticias de California that Costansó's manuscript map (referring to this one) is "one of the rarest items of Californiana ... only four copies of it still exist" (Hammond Noticias de California p 11). Cohen Mapping the West pp 61-63; Wagner Cartography of the Pacific Northwest 620 ("of extraordinary rarity").

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