Introductory Note: I have posted about many different aspects of the history of US commemorative coins here in the US Commemoratives area of CCF, most with "Commems Collection" in their title to enable automatic inclusion on the "Commems Collection" list created by Bobby. In addition, however, I have also posted about the design elements found on many of the coins over in the "Post Your..." galleries area, as well as within posts here under non-coin-specific titles. I've decided to collect these multiple design discussions for each coin of the series in one place for quick access, I present...
1936 San Francisco - Oakland Bay Bridge Opening - Design Element Discussion Threads
It is a beautiful design and your example is a beautiful coin. Being originally from San Francisco, this coin and one for the Golden Gate Bridge in 1937 would have made a nice set. Perhaps there will be pair in 2036 and 2037.