Take a look at a Burrows Island piece that is currently on auction .........

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2135269354&rd=1

The piece (flag #904) has a grey felt bottom that is associated with California-made pieces and comes in a white Castle Studios box. Would think that this piece was a transition piece using up materials from California after production was shifted to Canada.

You'll note that there is no "Made in ...." sticker on the piece's felt bottom. Never having seen any California produced pieces, do they have a "Made in California" sticker, a la Canada, Malaysia, etc., on their bottoms??