Standed tinned copper 2.5 T&E: How old?

[antlewis]

I have recently found some stranded, tinned copper 2.5 T&E on a few inspections that I have been carrying out. As the form asks for the estimated age of the installation, I was wondering if anybody knows when this kind of cable was last widely in use.

Thanks chaps

 

[telectrix]

60's / 70's.

 

[truckster]

History of Cable