The box is open and marked "Spare" but the prop looks unused. No wear at all.
This was given to me when I helped someone clean out their shed.
Comes with a piece of hardware but I don't know what its called (see photos).
I'm happy to answer your questions and give you more details.
Manufacturer: Solas.
Brand: Titan.
Part # on propeller: M E 15 1/4 X17RT
Part # on box 1541-153-17
Diameter: 15 1/4"
Pitch: 17.
Blades: 3.
Splines: 15
Rotation Right Hand / Clockwise.
Engine: Mercury.