Marine chronometer case key

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Marine chronometer case key. The key is attached to a length of string.

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ID:	ZBA7860.3
Type:	Marine chronometer case key
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 4 mm x 10 mm x 33 mm
Parts:	9031 (Marine chronometer) 9031 (Marine chronometer glass) (ZBA7860.1) Marine chronometer; Winding key (ZBA7860.2) Marine chronometer case key (ZBA7860.3)