wow, almost as old as my (combined) Microsoft trackball, that is about 26 yrs old. Where yours has a bald spot from your finget, my trackball has lost ALL texture, so smooth a slightly sweaty hand slides easily. I have no idea how many hours it has been (ab)used for, I was unemployed when I got it and spent most of the day on IRC and playing games, good times. Haven’t found a decent replacement yet, I think my time is running out