That GT BB looks very similar to a Phil wood (but they all kind of do in a way). I'd be curious to see the whole spindle.

THe syncros BBs came in several configurations which I do not know the names of, but some models had a double wide bearing with two sets of ball bearings per side... there was also a version with "inset" bearings and the face of the cup was depressed... I am not sure why they would want to place the bearings closer to the center, but maybe it was to reduce the stress on the center of the spindle and allowed them to make the spindle lighter? Not sure, but it seems like it would be more flexible.