The two pictures are of a Borrani RW4075 wheels. The first wheel is a stamped (original) hub. The second wheel is a machined hub. As you can see, it is much more difficult to tell the difference between the stamped and machined hubs from the front. The stamped hub is a little cruder looking at the very front. The biggest difference though, and the pictures have trouble picking this up, is the curvature on at the back. The stamped hub has more curvature, or a bigger "dip" if you will. The machined hub is much flatter. This is hard to see in the pictures. This is much easier to see in person.