On the last day of September, I flew to San Francisco for dinner. That may sound a tad extravagant—and it was—but the event I had been invited to attend at the Golden Gate Club in the Presidio was worth the long-distance commute.  San Francisco retailer Shreve & Co. and Swiss watchmaker Patek Philippe were hosting a dinner that served as something of an exclamation point to the former’s big announcement: In mid-2016, the 163-year-old jeweler will move into a new flagship store on Post Street near Union Square, just 200 yards from its historic location. This isn’t your run-of-the-mill move. Shreve took up residence in its old home just before the big earthquake of 1906. In March of this year, the landlord secured a better deal with Harry Winston and told Shreve & Co. co-owner Lane Schiffman—vice president of Schiffman’s in Greensboro, N.C., which acquired Shreve in