LOT AI one piece You get the item shown in the posted photos. Insured tracking and possible signature. Please see other stock certificates currently listed. Will combine as needed. Bond signed: ” Theodore Sutro ” as President and H. Thayer as Secretary of The Comstock Tunnel Company, 10×13½. New York, 1889 September 1. “Four percent, Thirty Year, First Mortgage Income Bond”. Adolph Sutro’s tunnel proved that tunneling was an effective way to drain and ventilate the many mines in the Comstock Lode, enabling miners to safely bring out the rich ore. Silver deposit to this day. Adolph had two sons and four daughters.