A. Lange & Söhne. A Very Fine and Rare Platinum Twin Barrel World-Time Wristwatch with Oversized Date, Day and Night Indication, Power Reserve, and Hack FeatureSigned A. Lange & Söhne, Glashütte I/SA, Lange 1 Time Zone Model. Ref. 116.025, Movement No. 52'773, Case No. 164'392, Circa 2006Cal. L031.1 three quarter plate twin barrel mechanical movement, 54 jewels, screwed gold chatons, two hand-engraved bridges, solid silver dial, eccentric engine-turned hour dial with applied gold Roman and diamond-shaped numerals, two small subsidiary dials for day/night indication and constant seconds, eccentric engine-turned subsidiary dial for second time zone with Arabic numerals and day/night indication, large double aperture for date, fan-form power reserve, outer rotating ring with the names of 24 world cities, large circular case, date correction button and second time zone and world time adjustment button in the left band, stop-seconds hack feature activated by pulling the crown, sapphire crystal display back secured by six screws, platinum A. Lange & Söhne buckle, case, dial, and movement signed42mm diam.