I was given a very unusual racket to string the other day - a Pro Kennex Carbonpro 767 - which I was told was 17 years old. It's so old I had to take notes on the pattern before I cut the bed, which was the very early nylon that looks (and plays) like washing line. I would guess the tension was about 17lb, which makes me think the string was original. I'll take some pics later; it looks very strange with Nanogy 95 sat in it! Can anybody beat this record for racket superannuation? You have to have strung it for it to count.
Oh so easy. I have strung a Carlton3.7x before. The oldest Yonex racquet I have strung is the cab10-the fibreglass version.