Crystal: Some Scratches at the crystal. The tachymeter bezel is the distinguishing feature on iconic chronographs like the Omega Speedmaster and Rolex Daytona. The logarithmic scale is proportional to one over elapsed time (1/elapsed time) and therefore is used to measure units per time increments. Most common of these is speed in miles per hour. However, you can also calculate units per hour on a production line, pitches per hour during a baseball game, or the average rate of any other repeating event.
Start the chronograph when one unit passes (mile marker, widget, whatever), stop it when the next unit passes, and read units per hour on the scale. Manual-wind chronograph, 60s, 30/45min, cam switched. 13.75''', Dm= 31.0mm, Do= 31.5mm. Balance staff U1457 / U3137. Zf978, 1.35 x 12.0 x 0.14 x 360mm.1.85 x 1.30 x 0.25 / 0.27 x 0.20mm. There were various chrono mechanisms. And as their parts often were interchangable, occasionally series were produced with parts of different calibres.
We are not responsible for wrong or undeliverable address. The item "ULTRA RARE VINTAGE SWISS DIVER WATCH ROYCE CHRONO LANDERON 248 CIRCA 1962 RR" is in sale since Tuesday, January 28, 2020. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Wristwatches". The seller is "aboim61" and is located in Lisbon.
This item can be shipped worldwide.