Case size: 33 x 49 mm
Material: gold/steel
Movement: quartz, caliber 1511
Year: circa 1974
Crystal: sapphire crystal
Bracelet: integrated original bracelet, folding clasp, ref. 1209/202
Reference number: ST 398.0836
Serial number: 37.057.281
Service May 2016.
The Omega Marine Chronometer was the first quartz wristwatch ever to be awarded certified status as a marine chronometer. The watch was made by Omega SA and developed by John Othenin-Girard and is one of the most accurate non thermo-compensated production watches ever made, keeping time to within 1 second per month