Star plotter altitude ruler pointer

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Star plotter altitude ruler pointer. Found partially sellotaped to the lid of the box.

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ID:	NAV1027.5
Type:	Star plotter altitude ruler pointer
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 4 mm x 24 mm x 18 mm
Parts:	Star plotter Star plotter (NAV1027.1) Star plotter altitude ruler (NAV1027.2) Star plotter time scale (NAV1027.3) Star plotter box (NAV1027.4) Star plotter altitude ruler pointer (NAV1027.5) Star plotter altitude ruler pointer (NAV1027.6)