An early 20th Century gun metal Omega chronograph crown wind pocket watch, enamel dial marked Omega Cadran Brevete S.D.D.G. SGDG Tachymeter Dial: The tachymeter dial allows the measuring of any speed between 10.5 and 140 miles per hour without the help of calculations. 15-minute counters starting with 5 individual minute segments in different colors to indicate which color will show the speed on the spiral tachymeter scale Original hands Central second Movement: 3/4 plate movement, frosted, very good, fast, finish chronograph steel parts, ratchet wheel, polished screws, screw compensation balance, blued balance spring, index spring fine adjusting device. Case: gunmetal Gilt copper bow and crown Nr.:3522773 Weight:132g Diameter: 58mm Thickness: 19mm RECENTLY SERVICED & IN WORKING CONDITION