Unknown metal object

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Unknown metal object belonging to the astronomical compendium for latitudes 0°-74° North. Can be found inside the box.

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ID:	AST0463.4
Type:	Unknown metal object
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London, Georges Bernard Collection
Measurements:	Overall: 5 mm x 74 mm x 7 mm
Parts:	Astronomical compendium Box (AST0463.1) Small, thin piece of metal with 7 notches / grooves (AST0463.2) Pointer? (AST0463.3) Unknown metal object (AST0463.4) Latitude arc (AST0463.5)