Submarine periscope eyepiece?

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Submarine periscope eyepiece?, part of a U-Boat periscope.

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ID:	NAV0857.3
Type:	Submarine periscope eyepiece?
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 20 mm x 40 mm x 40 mm
Parts:	Submarine periscope Submarine periscope prism (NAV0857.1) Submarine periscope object glass (NAV0857.2) Submarine periscope eyepiece? (NAV0857.3) Submarine periscope filter (NAV0857.4) Submarine periscope filter (NAV0857.5)