Your oldest gear?

The longest piece I have owned and also in present use is the Ariston RD11S I bought new in 1977 for $380. I then added a secondhand SME 3009 arm ($150) and a Microacoustics 2002E cartridge ($90). Now it has a Grace 707 arm and Denon 103 cartridge.

Nakamichi Cassette Deck 2, mid 80s

Factory wired Dynaco ST-35.  Bought it at Korvettes around '65.   Rebuilt and still using it.

My Michell Gyrodec bought 1992 and upgraded in 1995 with an Orbe platter, HR power supply and DC freestanding motor. Audiolab 8000ppa phono stage in 1996, both still going strong, with only the odd belt change over the years (see my system pics).

I have a circa 1987 front end as one of my systems. All British and from the same period separately bought over the last five years.

Logic DM101 Mk2 electronic turntable.

Syrinx Ipsissima PU3 arm, recently rewired by Audio Origami.

Goldring G900IGC cartridge, + NOS stylus.

All three are top examples of a typical set up of well engineered matched components. I managed to restore the deck back to its former glory after years of neglect. A total outlay just over 💰1,000 (excluding stylus)
 

10 years back l also had a wise buy. I purchased a pair of Acoustic Energy AE1 MK1 speakers manufactured in the late 80s. A real steal at a quarter of the price when new, plus with the lead filled iron pedestals designed specifically for that model. Still sounding outstanding in near mint original condition. 
 

Something to be said for buying used gear and except for the arm rewire all unmodified. Still reliable nearly 40 years on