Emerald war eine britische Automarke.[1][2]
Das Unternehmen Douglas S. Cox & Co. aus West Norwood in London begann 1903 mit der Produktion von Automobilen. Der Markenname lautete Emerald. 1904 endete die Produktion. Später fertigte das Unternehmen den Osterfield.
Das einzige Modell war eine Voiturette. Ein Einzylindermotor mit 4 PS Leistung trieb über einen Riemen die Hinterachse an. Das Getriebe hatte zwei Gänge.
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