Entrance to Fort Mason, Showing the General's Headquarters

Front:
Entrance to Fort Mason showing the General's Headquarters, San Francisco. California PRIVATE CROUNDS PERSONS NOT HAVING BUSINESS NOR DESIRINC TO CALL AT OFFICERS QUARTERS NOT ADMITTED. 163732

Back:
No. 651 Here, 1c to United States Canada or Mexico 2c to all other Countries, Chas. Weidner, Postcard Publisher, San Francisco, Cal.