Heuer - Pilot Chronograph - 230.006 This reference was the first of the Quartz pilot chronographs, and was made from 1980-1985. This quartz version is unique in that it measures time in half-second intervals instead of one-second intervals like most quartz watches, so the chrono second hand "jumps" 120 times a second. The date window is also kind a unique in that it has a "Cyclops" magnifier, but rather than stick it on the crystal like Rolex does, Heuer put it in the dial between the date wheel and the space between the dial and hands. Reference No: 230.006 Case Material: Stainless steel Diameter: 42 mm Dial: Grey Glass: Plexiglas crystal Bracelet: Stainless steel (President) Bracelet Length: 21 cm (Including case) Clasp: Folding Condition: Worn & Very good condition Movement: Quartz Functions: Date, Hour, Minute, Small second, and Chronograph Extras: Travel box (Aftermarket) Sent by DHL Express, FedEx, or UPS (it's so safe and fast) *Optionally, shipping from Europe is available with an additional payment. #WatchResources