Updating and bumping for frenzy:
I found the box with the NOS "SACHS-SEDIS Sedisport ATB" chain.
it's 2-color with black inner and silver outer plates, marked 116 links on the box.
I can see nothing about this chain that makes it particular to an ATB versus a Road bike, not extra beefy looking or sealed with O-rings, but this is how they advertised it.
If I get any interest (even less than a frenzy) I'll post it for sale in that section. Even some pics!