keyless wind twenty-three jewel 43.15S calibre rhodium-plated movement with compensated balance with gold poising screws and blued steel Breguet hairspring, index regulator with swan-neck spring and precision-regulating device for fast / slow by means of an eccentric snail, adjusted to 6 positions and temperatures, signed, inscribed 'GRADE VERY BEST' and numbered 5983836, signed white enamel dial with suspended 'Breguet' numerals and hands, subsidiary seconds dial, inscribed in red 'Chronometre', plain polished gold hunter case, signed covers, cuvette inscribed 'Chronomètre Oméga', numbered to cuvette and covers 7609222, 18 carat gold French import mark, case 52mm diameter, with its original box, leather pouch and 'Bulletin de marche' (Watch rate certificate) No. 3567 from the Bureau Officiel de Contrôle de la Marche des Montres at Bienne / Biel (dated 16 November 1936)

See an example sold Antiquorum, Geneva, 14 May 2017, lot 89, where noted that this precision calibre was made from 1922 in only 600 examples, 300 hunters and 300 open face watches. The cost of manufacturing and regulating such high precision movements was very high and hence they were often reserved for the manufacturer’s best clients. Apparently an Omega of this type cost SF1085 in 1929, whilst a standard Patek Philippe gold hunter could be bought at the time for SF385.