There have been several generations of the Brent Dellenger Signature Model. This is the first, the original Spinmaster, before they had to add a versions number to the name. I love the half red half blue colors on the side caps.
This one is also in opaque white. The early clear and translucent ones were very prone to cracking along the edge of the weight rings. These were thermal cracks as the metal ring expanded and contracted at a different rate than the plastic body. But no worries on opaque colors like this one.