Your Forever Pieces? What and Why?

Nak CR-7a (couldn't afford Dragon) remains in main system since purchased new in early 90's

Perreaux 3150, been a back up recently put back into service as I need to get ML 333 in for service, early 90's

Bedini 100/100 bought used when I picked up first pair of used shahinian obelisk-mis 90's

Krell KSA 50S, still an amazing piece.  Recapped by Krell once

My Carver ALS lll speakers.

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