Letter from S. Koya, Consul of Japan, to Adolph Sutro, Mayor of San Francisco, July 30, 1896 A handwritten letter from S. Koya, Consul of Japan, to Adolph Sutro, Mayor of San Francisco, dated July 30, 1896. The letter is written on Consulate stationery and discusses the Sutro Tunnel and the Comstock Lode.