I found the photo on the following website when I did a search for whirling log.
It is an interesting read. I knew about most of the symbol uses but didn't know that Coca Cola used it once too.

http://www.deanesmay.com/posts/1103539026.shtml

Here is a link to a whirling log pin on ebay now .
http://cgi.ebay.com/Whirling-Rolling-LOG-PIN-SIGNED-Native-American-Vintage_W0QQitemZ180168127446QQihZ008QQcategoryZ150019QQssPageNameZWDVWQQrdZ1QQcmdZViewItem