Approx. Ø59mm, approx. 145g, 14K gold, Savonnette, bez. CHRONOMETRE OMEGA, Observatory chronometer calibre 43.15S, highest Omega-manufactured quality of an observatory chronograph, CHRONOMÈTRE GRADE VERY BEST with 23 stones, bolted gold chatons and fine regulation, special elevator mechanism, where the crown has to be pressed into it, original enamel dial, red gold hands, original box, very nice Maintenance status, functional. The watch is delivered with Omega certificate, sold to Finland on May 18, 1924. Originally a "Bulletin de Marche" of the Bienne Observatory belonged to the clock. These Omega chronometers are absolute rarities. The number 5983741 was auctioned in Geneva in 2007 and reached over 20,000 Swiss francs!