Not seen one of those before. I like the shape and no rails to snap.
The market is somebody doing a full WR Compositi build, to get proper money for it, as anyone else looking for a light carbon saddle, like a hillclimber for example, will just go to ebay/aliexpress and get one for less than £30, as mentioned above. I have seen the no-name charbon saddles around the 90g mark sell for as little as a tenner in used condition. Hillclimbers don't sit on them much anyway and drill holes in them to get 100g saddles down in weight.
as it is so rare i think you should hold on to it until the right buyer turns up, or you do another build it is suited for.