Actually, it seems identical to the Microsoft Trackball Optical Mouse (D67-0001): https://sep.yimg.com/ay/yhst-90432262887525/microsoft-trackball-optical-mouse-

Actually, it seems identical to the Microsoft Trackball Optical Mouse (D67-0001): https://sep.yimg.com/ay/yhst-90432262887525/microsoft-trackball-optical-mouse-p-n-d67-00011-1.gif https://sep.yimg.com/ay/yhst-90432262887525/microsoft-trackb... I loved that trackball!