CASE: Three-body, polished and brushed, concave lugs, stepped bezel, screwed-down case back.DIAL: Black with luminous Arabic numerals, outer minute/second division, most outer 24 hours revolving disc, worldtime cities around the rim, aperture for the date. Luminous hands.MOVEMENT: Cal. 30750, rhodium-plated, fausses cotes and oeil-de-perdrix decoration, 31 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring, hack mechanismDial, case and movement signed, in excellent condition; AS NEWDIAM: 46 mm THICKNESS: 13 mmNOTE: This model has been designed with Aviators and world travellers in mind and has the ability to keep track of the various time zones. The 46 mm dial displays the local time with a vertical date display inspired by a traditional altimeter and a 24 hour ring which encircles the dial and allows you to read the time in all 24 hour time zones.