If you care too, please help me in searching the San Francisco Historical Photograph Collection for evidence that the sign existed before 1965. I have already searched Flickr Commons, to no avail, but could always use a triple-check. The sign is located at the corner of Tompkins and Banks.
Update, 17 February 2011: I searched Flickr Commons, but found no results. I also searched the San Francisco Historical Photographs collection at SFPL, but didn’t find anything there either. I contacted SF City Guides and the Mechanics’ Institute Library. The latter pointed me to the California Historical Society’s photograph collection. Then I remembered that SFPL recently digitized their city directories. I found “Tipton’s Gro” at 601 Tompkins on page 828 of the 1964-65 directory. This does not prove that the Coca-Cola sign existed, but searches for Tipton’s Grocery/Grocers may uncover something. I hope this helps.