This 3 1/2″ shoe button hook has a street address: 825 Market ST. San Francisco.
It also has a business name: PHILADELPHIA SHOE CO..
Philadelphia Shoe Co. must have been a fashionable establishment. The renaissance revival style James Bong Building was built in 1908 after the 1906 earthquake by Lewis Parsons Hobart (Wikipedia). It is still standing today in the Financial District of “The City.”