This automatic chronograph Monaco Calibre 11 is THE original model, the very first square and waterproof chronograph in the world. Revolutionary and icon of the \"King of cool\" Steve Mcqueen, this calibre 11 edition still features the famous crown on the left; it was a way of showing that manual winding was no longer necessary. The groundbreaking design elements are all in place: blue dial with horizontal steel indexes, silver sub-dials for chronograph minutes and chronograph hours, date at 6 o’clock, and a red chronograph hand to give it a racing touch. The ultimate racing ‘touch’ is provided by the seriously stylish strap: black calfskin leather with a special finish inspired by racetrack asphalt. First seen on the wrist of Steve Mc Queen’s in the classic race film Le Mans in 1969, the Monaco is a timeless icon of revolutionary design. Calibre 11: All TAG Heuer automatic movements are made in Switzerland and must meet extremely strict criteria for precision before they make it onto your wrist. Their high frequency ensures excellent mechanical precision. A number of TAG Heuer automatic movements are awarded an Official Swiss Chronometer Control (C. O.S. C.) Certificate, the ultimate recognition of precision and reliability. Description TAG Heuer Calibre 11, Swiss Made. Automatic calibre. Diameter: 30 mm (13’’) - 59 rubies. Rapid date correction. Perfomance Balance frequency: 28, 800 vibrations per hour (4 Hz).Power reserve: about 40 hours. Display Hours — minutes — small seconds at 3 o\'clock. Date window. Chronograph minutes counter at 9. Central chronograph seconds hand. Decoration Openworked oscillating mass: \"Côtes de Genève\" engraved, \"TAG Heuer — Calibre 11 — Swiss Made\".Case Size39mm Thickness14. 3mm Lugs Distance22mm Water Resistance100 Metres Case Material Steel Fine-Brushed/Polished Bezel Turning Bezel Steel Crown Steel Caseback Sapphire - Steel Band Material Leather Buckle Folding Clasp - Polished Steel