A Davis backstaff, the frame of lignum vitae with boxwood scales, central crossbeam with makers signature F. BLOW LONDON Fecit at ye Golden Quadrant at Union Staires in Plow Alley Wapping. with ivory inset inscribed for Mr. James McCulloch Ian. ye 23:1735, the smaller arc divided with scale 0°o-65°o, the greater arc graduated 0°o-25°o, lacing sights (some repairs) - 23½in. (60cm.) wide.

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A Davis backstaff, the frame of lignum vitae with boxwood scales, central crossbeam with makers signature F. BLOW LONDON Fecit at ye Golden Quadrant at Union Staires in Plow Alley Wapping. with ivory inset inscribed for Mr. James McCulloch Ian. ye 23:1735, the smaller arc divided with scale 0°o-65°o, the greater arc graduated 0°o-25°o, lacing sights (some repairs) - 23½in. (60cm.) wide.

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