Gold Wrist Chronometer no. 4763

Case: Yellow gold & enamel Dial: Gilt, applied Breguet numerals, blued steel cathedral hands, subsidiary secods dial, signed "A. Lange & Sohne, Geneve". Movement: s/n; 4763, 10''' tonneau, all adj, 18 jewels, Geneva seal. Provenance: 1927 - Niton, Geneve 1927 - A. Lange, Geneve, 21 Oct 1927 - Auction Heickmann, Chemnitz, Auction 71, Lot 5031, Sales books A. Lange & Sohne Genf/ Article Wolfgang Stegemann, Klassik Uhren, No. 2/2011 page 40-43 and No.2/2013 page 12-13/ Privat Wolfgang Stegemann 18k green gold, tonneau case, regarding A. Lange Cal. 5 ½''' Notice; serial number 4763 is not in TimeLabs list but it is for sure a A. Lange & Sohne watch made by Niton. But it is known that errors have been found in TimeLabs digital database when transferring the hard copy serial numbers to the digital database. And also, the transfer of the movement serial number on the movement to the database. Another serial number 4768, almost similar to 4763 obtained the Poincon de Geneve quality seals on September 29, 1927.