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Old 04-05-2019, 02:01 PM   #4
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Join Date: Nov 2008
Posts: 1,043

It's half of a 4-blade propeller for the Curtiss HS2L flying boat. See this link.

This model must have been produced in very large quantities. It turns up frequently. I've seen one matched set (consecutive serial numbers) but all of the others have been stand-alone.
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