By the help of the good people on the Lead Adventures Forum my ‘mystery piece’ is no longer a mystery. As it turns out it indeed is a Grenadier model, produced in ’87, for the Dragon Lords series of boxed sets. This one is entitled Encounter at Kohmar-Lolth. A great name isn’t it? Very Robert E. Howardian. The piece was sculpted by Andrew Chernak.
As I suspected two torches and even a crystal ball on a pedestal is missing from the throne. I’ll definitely have to try and make something similar once I get going at the model. As you can see from the picture below a lot of other stuff was also included in the original box, which apparently never made it into the collection I acquired last year.
I’m actually looking very much forward to get started on this model now. Keep an ey ut for the lich king of Kohmar-Lolth on this blog!