A New & Accurate Map of North America (c. 1790s)

This is a hand-colored copperplate engraved map titled 'A New & Accurate Map of North America: drawn from the latest authorities with the new discovered Islands on the North East coast of Asia.' The map depicts the North American continent, Central America, and the Caribbean, notably featuring an incomplete Pacific Northwest and the mythical 'River of the West.' It includes a cartouche in the lower-left corner with various topographical details and text. The map is printed on laid paper, showing characteristic vertical fold lines, indicating it likely originated as a supplement in an 18th-century geographical publication or atlas. The coloring consists of light pastel washes in pink, yellow, and green, used to define territorial boundaries and coastal regions. Measuring approximately 10 by 14 inches (sight), it is housed in a modern matted frame with a simple metallic gilt edge. Condition-wise, the paper shows minor toning consistent with age, several visible vertical creases from its original binding, and some slight rippling under the glass. The engraving displays fine craftsmanship with delicate lettering and crisp line work, typical of late 18th-century cartography from English or European mapmakers like Thomas Conder or William Russell. The presence of the 'Parts Unknown' in the Northwest and the inclusion of Captain Cook's discoveries place this map's production in the post-1780 era.

I have conducted a visual examination of this 'New & Accurate Map of North America,' likely engraved by Thomas Conder for 'Moore's New and Complete System of Geography' (c. 1785-1790). The map exhibits hallmarks of late 18th-century production, including visible chain lines on laid paper and distinctive copperplate plate marks. The presence of the 'River of the West' and the incomplete Northwest coastline confirms its era, reflecting the transitional cartography between Cook’s voyages and the Vancouver expedition. The hand-coloring appears to be period or early-style wash, which adds to its decorative appeal. Condition is fair to good; while the vertical 'as-issued' folds are expected for a periodical supplement, there is visible toning and minor rippling suggesting environmental exposure. Authenticity appears consistent with late 1700s printing techniques, though a physical inspection is required to verify the watermark and paper texture. Market demand for 18th-century North American maps remains steady, particularly for those showing the early United States and 'parts unknown.' Comparables for Moore/Conder maps of this size typically hammer between $300 and $500, with retail gallery prices reaching higher for framed specimens. Values are tempered by the fact that this was a mass-produced plate for a common geographical work. Limitations: This appraisal is based on digital images alone. To finalize authentication, I would need to examine the paper out of the frame to check for repair, measure the exact plate mark depth, and confirm color chemistry. Provenance records regarding its removal from the original atlas would also strengthen the valuation.