This is a sealed cartridge damper from a well known brand and sits within one of the stanchions hidden from the outside World.
The 5wt (16cst) Teflon infused oil which is used in these dampers is a slightly milky opaque colour, as you can see its somewhat dirty looking as this point.
Full damper rebuild which includes new seals, O-rings and piston glide rings, and of course fresh oil.