375 Valencia
Well, technically it's *next* to 375 Valencia. This sign over Four Barrel Coffee advertises the now defunct Par-T-Pak cola brand. Par-T-Pak, distributed by Nehi Beverage Company, was a line of quart, or "family sized" sodas sold between 1933 and 1954. These bottles were returnable and came in a variety of flavors such as Orange Soda, Ginger Ale, Tom Collins Mixer, Club Soda, Cherry Soda, Cola, Sparkling Water, and Root Beer.
There's another Par-T-Pak sign in the Tenderloin: www.flickr.com/photos/kaseysmith/6403367887