@keykeeper The vice has a full leg, The Bottom tightly sits in a piece of pipe that is welded to the main baem (stand). There are also some smaller beams welded to the main one for extra strenght in de concrete.
@yesteryearforge I don't know the brand of the vice, there are no markings on it. This type is very common here, i think it's German. Also the plate riveted to the side of the vice is practically standard here.