Help Identify Airboat Prop?

[Snwbrdr57]

I was recently at the EAA show and bought this propeller. It was labeled as a 70'' Sensenich prop, but after some research it doesnt appear to be one. I even contacted Sensenich and the markings were not theirs. The prop has no logos or stamps other than the 8 numbers, which identify the leght, pitch, etc. However, the one unique thing about the markings is how they are stamped. instead of being in a row, the first two and last two are indented above the 4 middle numbers. Does anyone recogize what company/brand this might be? See pictures attached. Thank you again for your help!!

Southern Airboat Prop?
Sensenich Prop?
ArrowProp?

Thanks again,
Eric

[Dave]

I think the first numbers just represent diameter and pitch, and the lower number is likely a serial number.

Without knowing manufacturer it's even harder to know what it was used on.