Three-body, polished and brushed, screw-down case back and crown, engine- turned bezel, crystal with cyclops lens. Silvered with applied steel baton indexes and luminous dots, outer minute/seconds divisions, aperture for the date. Luminous steel baton hands. Cal.1570, rhodium-plated, 26 jewels, straight-line lever escapement, monometallic balance adjusted to temperatures and 5 positions, shock absorber, self-compensating free-sprung over-coiled balance spring, Microstella regulating screws, hack mechanism.