I thought that TR King stopped making Large Crown chips in the 1960's.
I have one of the brown chips and have it as an unknown. Here is the auction.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=63760&item=6129031989&rd=1&ssPageName=WDVW

Hava Good One, Richard
PS Just came back from meeting with David Spragg and Lynn at Harrah's. Wonderful people and some fun chippin'