A mid 18th-Century Davis quadrant (back-staff)

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A mid 18th-Century Davis quadrant (back-staff)
constructed in lignum vitae with box wood arcs (lacking vanes) and sight, the small arc divided 0-60 and the great arc divided 0-25 & 65-90, the frame with space for makers plaque (missing; old damages) -- 24in. (61cm.)
See illustration
Sale room notice
Please note estimate is revised to 2,600-3,000

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