Nice find.
I'd suggest because of its inside curve, it's from a 1910 to late 20s aircraft.
In fact, because of its shape, it suggests to me a WWI-era relic because of their curved props.
After the late '20s military aircraft, as well as high performance civil types had metal props.
Lower performance civil aircraft had (and still have) wood props, but I can't say I've seen a Piper Cub-class prop with the inside curve as shown. I'm looking at my Sensenich right now. While similar, it's clearly not as curved, nor does it have as many rivets.
Might I suggest going to the Naval Aviation Museum at Pensacola and look at some of their early aircraft...or photos of them.
Last edited by
JohnB on Fri Feb 10, 2017 9:21 am, edited 2 times in total.