This is a stainless steel Girard Perregaux World Time WW.TC Chronograph, 49805-11-650-BA6A. It has an alligator leather strap with a stainless steel folding deployant clasp. The 43mm diameter solid three-body case is brushed and polished with downturned lugs, a rounded bezel, and a sapphire crystal and transparent display case back with 6 screws and the 46-hour power reserve indicator. It has a screwed down winding crown at the 9 o'clock position for moving the city disc, oval chronograph pushbuttons at 2 and 4 o'clock, and a crown for adjusting the time and night/day function at 3 o'clock. It includes a patented coupling mechanism that advances the ww.tc (world-wide time control) ring displaying the 24 cities (and representing their time zones). The dial is black with luminescent dot hour indexes, and an Arabic numeral marker at 12 o'clock. It has luminous lozenge hands, a subsidiary small seconds dial at 3 o'clock, and the chronograph 12-hour register is at 6 o'clock, while the 30-minute register is at 9. The date window aperture is between 1 and 2 o'clock, and there is an outer revolving ring with painted Arabic 24-hour numerals, inside of which is a minute track. It's water resistant to 50 meters. The automatic self-winding Girard-Perregaux caliber GP033C0 movement is rhodium-plated, with fausses cotes and oeil-de perdrix embellishment. It's constructed with 63 jewels, and a shock absorber mechanism. It has a straight-line lever escapement, a self-compensating flat balance spring, and a monometallic balance that's adjusted to 5 positions. It includes a hacking seconds mechanism, and the movement oscillates at 28,800 vph (4 Hz). The 13.9mm thick case, dial, and movement are all signed. Girard-Perregaux debuted the ww.tc chronograph in 2000, and this model was introduced in 2010.