Incredibly rare WW2 era, Boeing Stearman McCauley Propeller blade, made from Steel.
As corrosion/ water ingress is always an issue with Naval aircraft, these were used instead of the more popular aluminium or wooden propeller blades
Ultra slim/sleek blade profile, only achievable with a hard material like steel.
Very unusual
Approximately 49.5 inches/ 126cm
Very heavy for what it is at 13kg