It clearly says Lego on it, but I have no idea what it is. The only number inside is 4-01. 
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This is a "Underwater Scooter". It's a handheld device to propel a diver forward.
Similar devices can be seen in the James Bond movie "Thunderball".
Dave DeLong
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This is part is commonly found in the Divers theme back in the late 90's (http://brickset.com/sets/theme-Town/subtheme-Divers) The part in question is a minifigure accessory:
ninnymuggins003
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1For what it's worth, the "underwater"-themed AlphaTeam sets also had this piece, but in black. – apnorton Apr 15 '15 at 18:17