Need Help Identifying Old Wooden prop

[highway47mx]

We have an old wooden propeller that measures 71-1/2" long and only has two bolts in the center. We think it came from WWI and may be German. It has copper or brass edging on the ends.

I can take more pictures if it will help - thanks!DSCF0956.JPG

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[Dave]

It looks to me like it's a wind generator propeller used in vineyards. They typically had that shape and usually only 2 bolt holes at the hub. Aircraft propellers typically have 6 and more commonly 8 bolt holes at the hub. Here's a picture of one in California: