A scarce Dutch double-hemisphere world

An uncommon world map drawn by Gerard Valk (1652-1726) and his son Leonard (1675-1746). In the Western Hemisphere California is an island; a Northwest Passage is suggested by a 'Mer Glaciale' leading from Hudson's Bay towards the Strait of Anian; a 'Terra Incognita' fills the North Pacific; and the partial coastline of New Zealand appears, based on the mapping of Abel Tasman in 1642. In the Eastern Hemisphere the semi-mythical 'Eso' (Hokkaido) is connected to mainland Asia, with a separate 'Compagnies Land' adjacent; Australia is depicted without an east coast, with the suggestion that Cape York is connected to New Guinea and Tasmania shown as a distant island. The decorative borders have allegorical scenes representing the Four Seasons with polar projections in the cusps.