This Rare American Box Chronometer. By Norman. M. Saati Providence Rhode Island made for the Pan- American exposition. With going barrel and one wheel train with worm gear power transmission to a recessed center mounted escape wheel. Note: Excerpt from the June 23 1887 issue of the Jeweler's Circular and Horological review states, this timepiece will revolutionize the entire system of Horology, the Chronometer has no gearing and no pinions in the movement and by this means all friction is avoided.