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My chip has the same reverse side that is shown on your scan.

The information was provided by Gene Trimble, so while it may/may not be considered "Gospel" I'd say it's definitely very close.

Chuck Mades did a "My Chip of the Day" post on 01/03/03. I responded with a scan of the S chip.

Link: http://www.thechipboard.com/cgi-bin/tcbarc08/tcbarc08.pl?read=232682

Gene responded with the following:

Chief Robert Satiacum owned the chips. He was a Payullup Indian. He ran illegal clubs in WA for many years. He was convicted of racketeering in 1980 and fled to Canada. I had more of the story but can't find it. Will look more tomorrow.

Link: http://www.thechipboard.com/cgi-bin/tcbarc08/tcbarc08.pl?read=232696