Asking price for KEF Reference 204/2C?

I'm in the process of downsizing and need to sell a number of components, most of which I've found in the Audiogon Blue Book.  But I don't see anything for the KEF Reference 204/2C.  It's a large center speaker that seems to have been designed to match the highly regarded KEF Reference 207/2s, but it also matched the 107/2s seamlessly.  The speaker weighs nearly 100 pounds, is high-gloss black, and is in beautiful condition.  Anyone have an idea about an appropriate asking price?