Logitech UH106555-46643 LOG9043690403 - LOGITECH, INC. Optical TrackMan Cordless Mouse
A size comparison between the Logitech Cordless Trackman Optical, the Microsoft Trackball Optical, and the Elecom Huge, for if anyone is curious. : r/Trackballs
Logitech Cordless TrackMan FX Optical Mouse in Very-Good Condition | eBay