Power or manual steering?

The code on my fender tag says that this is a power steering car. The engine was swapped before I owned it, and now I'm just trying to figure out what exactly was done. I don't see a power steering reservoir or pump anywhere. I took some pictures. Can anyone tell by looking at it whether or not this is a power steering gearbox, or if it was converted to manual steering? Also what is that lock ring type thing that is currently just sliding up and down on the steering shaft?