This propeller is about nine foot long with metal sheath tips, and it has a patent on it from may 11 1920. it's number is 1339886. Please fill me in. Mike, Oakdalebud209@netzero.com, 209 847 1149
I have no idea what it is. You could check the patent number, but might find that it's for a component of it (like the sheathing) rather than the propeller itself. I have seen Hamilton propellers with a patent number stamped on the metal, and that's what the patent turned out to be for.
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