Mr. Can has been listing this one for years. He doesn't have to sell for a living, so he just lists, waiting for someone to meet his generally high prices. I've bought from, and sold to, him and he's a really nice guy. I enjoy his write ups, finding them entertaining though not necessarily historically accurate.
$400 plus would put that pipe at the top end of the range, but I've seen Kaywoodies go for the mid $300's, very rare pieces in immaculate condition. Kaywoodie has always struck me as underpriced, underrated, and a bargain on the estate market.