Mystery propeller

[Transfix]

Hi Guys,

I have the propeller in the attached pics but no idea of what it is from. If anyone can help identify it, it would be much appreciated.
The propeller measures 131cm in height, 28cm across at its widest point while the diameter of the connecting base is 14.5cm.

There does appear to be some faint lettering to the base, the only legible lettering however is : R.I.A.D.

[Dave]

Not much to go on, but I'd try contacting Monte Chase at www.notplanejane.com. He seems to know the most about variable pitch prop blades like that.