found a TrackMan Marble FX + questions about sample / polling rate : r/Trackballs
Logitech Trackman Marble Mouse
LOGITECH TRACKMAN MARBLE FX T-CJ12 WIRED COMPUTER MOUSE- MANUAL INCLUDED | eBay
Logitech TrackMan Marble FX Trackball
Marble optical technology : r/Trackballs
Logitech TrackMan Marble FX - Trackballs.EU
Vtg Logitech Trackman Marble Mouse Windows 95 Thumb Operated 3 buttons /box 1997 | eBay
Amazon.com: Logitech TrackMan Marble FX Trackball : 電子
Logitech T-CL13 TrackMan Marble Wheel
Logitech Trackman Marble FX T-CJ12 Mouse Tested Works | eBay
Ran across this subreddit and was inspired to dig out my old Logitech Trackman Marble FX. Haven't used it for 10 years, but I think I might run it as my daily