Did you ever recover your prop?

Stan is right on. Generally the 400 series stainless alloys will attract to a magnet and the 300 series will not. 300's are typically used for food service items and in the chemical making industry and have the highest resistance to strong acids.

No, I didn't Edgar. I was running about 45 mph when the prop shaft broke off at the bearing seal on the lower unit. The motor revved too high when it happened and it took me a few moments to realize what had happened. All the time I was coasting down and drifting in a 3 1/2 mph current. I went back and tried, but the stainless four-blade Hoss high performance prop was history. I just didn't get it marked closely enough with landmarks.

Thanks for asking.