From the photos, I suppose your Bartmann would be called a half hollow. However, it also is a dual hollow razor in that there is one hollow below the spine and then another one near the edge.

If you look at reflected light from an overhead fixture coming off the blade, you can rotate the blade so that the reflection travels from the spine to the edge. A single hollow razor will have that reflection shift uniformly from the spine to the edge. A dual hollow razor, which has a thicker belly between the two hollows will reflect the light differently. As you rotate the blade to make the reflection travel from the spine toward the edge, at some point in the rotation another line of light will travel from the edge to meet the line of light coming from the spine. The two lines will meet at that thicker belly.

If that was confusing, just try it and you will figure it out!