S-SPZ ???

[beachbby]

I am thinking about buying a wooden propeller from an antique store. The inscription says S-SPZ and under that is hard to read, but maybe it says 140-1.

It has a 4 bolt system.

Does anyone know anything about this propeller? I have pictures.

[MWP_Lamar]

With only 4 bolt holes chances are great that it isn't an airplane prop. Please do post pictures so perhaps one of us can tell if it's a drone prop, airboat or snow sleigh prop or perhaps a fan blade of some sort. I'm not familiar with the markings either.

Lamar