Nathaniel Draper

Hi- Can anyone help me identify this old Sachtler fluid head? It's a 100mm ball head that looks exactly like a Panorama 7+7, only there are no number markings on the tilt / pan drag wheels, and each wheel only has two stops, basically "drag on" or "drag off". I'd call it a Panorama 1+1 — only I can't dig up any reference to such a thing. The serial is 8011, and the sticker under the quick-release plate explains that there are seven counterbalance settings. Is anyone familiar with this?