Ref:3970, Case no. 2837144, Movement no. 875206, sold 1988
24-jewel Cal. CH27-70Q two button chronograph movement adjusted to temperature, position and isochronism, shock resistant suspension to free sprung Gyromax balance, Seal of Geneva, silvered dial with fifth seconds ring enclosing applied gold baton numerals, subsidiary dials for 30-minute register incorporating 24-hour indication, 12-hour register with leap year index, date ring with aperture for moon phase, day and month in Italian in two apertures at noon, gold feuille hour and minute hands, blued sweep hand, screw back case with concave bezel and molded down turned lugs, maker's leather strap and 18K gold deployant clasp, accompanied by an Extract from the Archives and display box, case, dial and movement signed. 35mm