Tapered cylindrical bearing assembly - GIF

[Frank S]

Wonder what that's going to be fitted to, a ship prop shaft?

Thats not a particularly huge bearing so it could be used in a multitude of machinery, doubt if would be used on a ship's prop shaft, since most marine shaft bearings are designed as split bearings to allow replacement without the need to remove the shaft.
I would be more inclined to think the bearings shown might be used in the mining industry, or in something like a rolling mill