Platinum & diamond Wrist Chronometer no. 5820

Case: Ladies Dial: Silvered, arabic numerals, blued steel hands, unsigned. Movement: 7''' baguette, nickel, bi-metallic balance with blued steel balance spring with Breguet overcoil with polished steel kidney piece, signed "5820, Eighteen 18 Jewels, Eight 8 Adj, Niton, Geneve, Swiss", stamped with the Geneva seal. Provenance: 19?? - Niton, Geneve 2017 - Gardiner Houlgate auction, Bath, UK, 25 Oct 2017, est £1,200-1,600, sold £1,200 "Fine quality Art Deco platinum and diamond lady’s cocktail watch, rectangular silvered dial with Arabic numerals, cal. 5820 18 jewel movement signed Niton, Geneve, the case set with round and baguette-cut diamonds, stylised pierced swing lugs on a two strand link bracelet and clasp set with further diamonds, estimated 4ct approx, case reference no. 6347, 24.2gm, 10mm wide, 6.75" long, boxed". This Caliber 7''' was also used by Patek PhilippeThis Caliber 7''' was also used by Patek Philippe for the ladies Reverso 106.