I've never seen Gardena chips with zig-zag mold. Either very old series, or maybe a Noll sample that wasn't used at the Gardena club? El Dorado Inn is a mystery to me. El Dorado Street was, of course, the main north-south highway (40?) into Stockton in the Old Days before I-5 came shoving through. Today there is an El Dorado Inn there but I don't know if it existed way back when, much less if cards were played there.