• CHF3 000 - 4 000
• CHF 3 910

Extremely rare experimental center seconds pocket chronometer movement in a later silver case. White enamel eccentric dial, with Breguet numerals and outer seconds ring on the border. Full plate gilt brass movement with cylindrical pillars secured by screws, going barrel, early pivoted detent escapement, plain brass three armed balance, flat balance spring with unusual bimetallic compensation curb on the regulator. Honoré Pons signature scratched on the front plate below the dial and on the dial enamel backing. Diam. 56 mm.