After whining yesterday about a computer keyboard that failed after a mere twenty-two years (less one month) of service, I figure I may as well remind you of some of the other antediluvian contraptions around here, including a stapler that has made it past 40.
Casio SA-53 digital watch: Purchased circa 1984. A succession of crummy bands, though the current one has now lasted ten years.
Now fifteen years, though this required me to spend approximately an hour this past weekend repairing a couple of broken links. Obviously this flies in the face of all that cost-benefit ratio stuff, but I have my rules.