That's for the one-off ebony and ivory Sandusky.
I don't have a copy to hand, so I can't check - but doesn't Sandor Nagyszalanczy's "Art of Fine Tools" talk about an even rarer version - an all ivory version, lost or stolen a few years ago, and built in replica quite recently ?
The boxwood version of this plane is clearly collectable, but not in that price range. Any idea what one of those runs to ?