That is an OMC SS prop. It looks like it has been repaired a few times, based on all the Numbers Stamped on the Hub
It is, or was, a 389948 13 3/8 X 17 SST II
I bought a new 1972 18' Caravelle tri-hull bow rider with a 125 Johnson V4. It had the factory alum. prop. On Sundays the family went to the lake for water toy fun. On Mondays, during my lunch hour, the prop would go to the prop shop for repair....almost every week.
In 1973 OMC came out with the SST prop and I recall the purchase price of $185...a chunk of money for a prop back then but was worth it. I don't know if the SST II was black Teflon coated too but it looks like that's what has worn off if it was black teflon. I guess OMC coated the prop to prevent corrosion back then. The deflector on the rear of the prop that deflected in rather than out like Mercury props was made of brass or bronze and wasn't painted and if you weren't careful you could knock it off. I never did but saw some props with it missing.
The other thing OMC did was upgrade the power tilt which I had to the scabbed on PTT in 1973. I thought long and hard about adding that upgrade but cost and would it adapt got in the way.
