Whats unique about it? It looks like a standard one button module with the paint washed off it to me? I could be totally wrong though as I haven't played with Pulsars for a few years.
The seller states " ....all the drivers are so tiny but if you look through a scope they almost look like the early drivers used on ragen synchronars?"
I am no Pulsar expert so it would be interesting to hear what others think.
Ah I see now, when I first clicked your link I only saw a pic, no auction page, I can see now that the display drivers are different, still none the wiser but it is something I haven't seen before.