What, in your system, have you owned the longest?

Burmester 961 speakers in 1996.
Michélle 

A few years ago I found a nice example of the earlier Ariston RD11 on eBay. This first version is virtually identical to the Linn Sondek. It has the long arm-mounting board and red power switch on the front left. Plinth is teak, while the LP12's are afromosia. Underneath, the same stamped steel keel and 3 spring suspension with Sorbotane foam. Two piece massive alloy platter driven by a low-torque AC motor. I added a vintage Fidelity Research FR29 arm and a Sleeping Beauty (Coral 777) lomc cartridge. And a black-anodized magnesium platter mat.

My LP's. Then my Revox A77 Mk3, bought new in '73 (from Walter Davies, then the owner/operator of a 1-man hi-fi shop in Livermore, California, more lately the developer of the Last Factory line of LP/tape/CD care products). 

While not the original two pairs of DCM Time Windows I had back in 1977, I am using a pair of late-production TW -1A's. Again, found on eBay in excellent condition!

Walker Proscenium TT from 1996.