Oldest piece of gear you own

I've got a pair of Sonus Faber Minuetto speakers in my office that I've owned for 20 years.

I just acquired a pair of Advanced Acoustics 440 Bi-Phonic Coupler Speakers from the late 50's - early 60's. My son says they're in great shape as he picked them up for me in Toronto. 22"X19"X4". Apparently the entire wooden face/board is made to resonate from behind via some sort of conventional dynamic motor for bass with a tweeter inset at the top corner. Weird.

I have a Marantz 2226 that my dad bought I believe in '79. I still use it once or twice a week.

My Phase Linear Series II gear.

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.