William Hood was noted as a broker in the 1900 list of CBOT members. He was #4378.
I haven't found too much on Mr. William Hood. However, his daughter, Alice, married Nikola Trbojevich, a nephew of Nikola Tesla and also an inventor of note, including the hypoid gear. While the connection to the stamp above and the hypoid gear might be a stretch, I figured a little summary on this important invention would be edifying:
Hypoid gears are found within the rear axle differential of some automobiles and trucks. The gears allow for the transfer of torque 90 degrees. From the Engineers Edge website: "Hypoid gears combine the rolling action and high tooth pressure of spiral bevels with the sliding action of worm gears."