CASE: Three-body, solid, polished, inclined bezel, lapidated lugs, snap-on case back. DIAL: Matte silver with applied yellow gold baton indexes and Arabic numerals, outer minutes and fifths of a second track, outermost light blue tachometer scale, subsidiary dials for the seconds and the 30-minute register. Yellow gold Dauphine hands. MOVEMENT: Rhodium-plated, straight-line lever escapement, monometallic balance, free-sprung self-compensating flat balance spring. Dial, case and movement signed, in very good condition DIAM: 39 mm. THICKNESS: 11 mm.