A Silver Open Face Chronometer Deck Pocket Watch, Patek Philippe, 60.00 mm case diameter, matte silver dial signed PATEK, PHILIPPE & CIE, GENEVE 170419, Roman numerals with outer minute track, 36 hour power reserve indicator at 12 o'clock, subdial for seconds at 6 o'clock, blued steel spade hands, coin polished bezel, polished circular case back engraved U.S. NAVY, polished cuvette, Cal. 21 manual wind nickel finish jeweled EXTRA movement signed PATEK, PHILIPPE & Co No 170419 GENEVE and numbered twice. Movement number: 170419. Inner case back: 0.900 274695 (hallmark) P.P.Co. Inner cuvette case back: 0.900 274695 (hallmark) P.P.Co. Accompanied by a fitted wooden case. Additional Note: For a rare set of three Patek Philippe silver pocket watches with Movement No.'s 170'414, 170'416, 170'417, Case No.'s 274'699, 274'701, 274'693, please see: Christies's: An Evening of Exceptional Watches New York December 7, 2017 Estimate 20,000-30,000