Francisco area instead of El Centro,Ca ? which is inland from San Diego.That would be interesting.I always thought they were different looking than the Battle Mountain chips and looked to be older as well.Thanks for the research on these beautiful chips.The Chip Guide does state the El Centro location with 2 other colors and then the 3rd being showed in my scan the red one.I'll have to read more into your reply to fully understand it all, and thanks for your input,Torrey