Your Forever Pieces? What and Why?

AR-3a Speakers bought in 1971. Have had the surrounds replaced several times, but they still are amazing, albeit power hungry, speakers.
Thorens TD-320 turntable bought in 1986. It is my mono rig now, and still plays flawlessly.
Threshold SA4e amp bought in 1994 to replace the Nakamichi PA-7, which used the same general circuit, but was not class A. There is NO substitute for class A!

This is pretty easy for me as I’ve had most of my gear forever already. 

My keepers, with the number of years I’ve had them, are:

IN USE

40 years - Altec Lansing 604C - 16 ohm, 101 dB. The serial number dated them at 1954, so they are as old as I am. They have been reckoned 3 times

33 years - VPI HW MK II (MK IV with SAM for last 8 years)

33 years - Sumiko MMT arm

31 Years - Julius Futterman OTL monoblocs, the OTL3 version made by NY Audiolabs. Converted tovtriode and with new caps 2 years ago

27 years - Beard P505 preamp

22 years - Mastering Lab crossovers. New caps 12 years ago

20 years - Koetsu Black

4 years - Koetsu Onyx, Koetsu Rosewood Platinum 

ON THE SHELF, for back up

46 years - Dynaco MK III monoblocs 

50 years - Dynaco PAS

Oldest piece is Harman Kardon T60 tt, purchased 1981, still use with a few mods. Dahlquist DQ-10's shortly thereafter, Conrad Johnson  MV55 a bit later. Don't use these two pieces anymore, fond memories make some equipment hard to sell.

I sometimes wish I did not suffer from fidgetitus!
Some absolutely stunning gear being revealed here.
If I make 3 years on an item its headline news worthy ... Lol.

Easy one: The Accuphase E-202 integrated amp I purchased new in 1979 and reconditioned in 2014. Sweet sound, stunning build quality. A classic. I also have the matching T-101 FM tuner that’s equally excellent. I would never sell them!