I used to own this very bike, sold it in 2018 after fixing the fork and giving it a general tidy up, I can tell by the o-ring I added to the stanchion to measure the travel, don't know why he's turned it round.
Fork was completely collapsed when I got it, to the point where the front tyre was dragging on the crown, this was the state of the internals:
added some home made elastomers and it was ok:
this is how it looked when I sold it:
I did a bit of research on the fork at the time and found this: