oldest tube(s) in your system

Brimar 6V6G st from the 40's in my Decware Mini Torii

Ken Rad JAN 6SN7 VT-231 black glass, military stock from 1944. One pair in an LTA Aero, and one pair in an LTA microZOTL L3. I like them better than the Ray Reserves — slightly wider/deeper soundstage, better imaging and decay. 

Cunningham 71A tube, in Tektron preamp (Italian company), this tube in production  from 1927 to early 40's, don't know exact date of mine. Also have any number of various 50's era tubes running in a number of  components.

 1950s RCA,and 1958 Amperex  all are Black plates D getters.

@audioman58 what kind of tubes are the RCA and Amperex and what are they in?

Other oldies in our system are: 2 x 1952 Sylvania T-plate 6BL7 GTA and 2 x 1958 Western Electric D-getter JW 2C51.