This is deja vue all over again. I just saw the "Castle in the Air" motto recently for the first time - on a "prototype" chip from the Cal Neva. According to the seller the design was rejected so I don't think the motto ever made it onto a chip used on the floor. Here is a link to the auction:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3266218474&category=899