This is one big prop and heavy.  Michigan PR54.  3 Blade, brass/bronze, right hand rotation, 15 spline, 5 1/16 shear pin.  Size not indicated.  Nice shape for it's age, t wasn't born yesterday.  Blade edges have some dings but overall condition is very nice.  Came in with a 105 lower unit.  It probably will work with other 4 cylinder Chrysler motors.