What is it?

[RCG]

I came across this propeller. The printing on the top of the hub is very hard to read. I will list what I can read.

serial # 4478529
RPM - 2450 I think.
ENGINE 6 44\OC\5 I think

On the side of the hub the number stamped is 18529 & 43K

The length is approx. 86 1/4 inches, 4 inch center hole with 8 mounting holes.
There is copper on the edge of the blade and it appears to be canvas on the ends.

Thanks RCG