My ARC SP3c preamp. I purchase it used in 1974 thru a classified ad in the New York Times. Of course, when I bought it, it was an SP3a1. I had it upgraded to SP3c in 2003.
Oldest piece of gear you own
I will start - Pass Aleph Ono, vintage about 1997 or so, followed closely by an LP12, ca 1998. Speakers and tuner both are from 2000. Newest gear is a cd spinner, Simaudio, ca 2011.