Platinum Watch no. 20550

Case: Platinum, rear engraved John C. Heffernan New York Stock Exchange45mm. Dial: silvered matte dial with rectangular triple window for combined day, date and month display, a fan-shaped and a square aperture for the Arabic jumping minutes and hours Movement: nickel-finished lever movement, 18 jewels, bimetallic compensation balance Provenance: 19?? - Haas Neveux, Geneva 19?? - John C. Heffernan, New York Stock Exchange [Possibly John C. Heffernan, Senior, born November 09, 1900] 2008 - Christie's 12 May 2008 lot 313 CHF 3,000 - CHF 5,000 CHF 7,500 "Haas Neveux. A slim platinum triple calendar keyless lever jump hour dress watch SIGNED HAAS NEVEUX & CO., GENÈVE, NO. 20'550, CIRCA 1920 Haas Neveux. A slim platinum triple calendar keyless lever jump hour dress watch Signed Haas Neveux & Co., Genève, no. 20'550, circa 1920 With nickel-finished lever movement, 18 jewels, bimetallic compensation balance, the silvered matte dial with rectangular triple window for combined day, date and month display, a fan-shaped and a square aperture for the Arabic jumping minutes and hours, in slim circular case with snap on back engraved John C. Heffernan New York Stock Exchange, case, dial and movement signed 45 mm. diam. "