A. Lange & Söhne. A Fine Limited Edition 18k White Gold Wristwatch with Power ReserveSigned A. Lange & Söhne, Glashütte I/SA, 1815 Walter Lange Up and Down Model, Ref. 223.026, No. 35/50, Movement No. 31'486, Case No. 171'085, Manufactured in 2007Cal. L942.1 three quarter plate mechanical movement, 27 jewels, silvered matte dial, black Roman numerals, outer railway minute divisions, two subsidiary dials for 48 hour power reserve and constant seconds, circular case, hinged case back engraved on the interior side revealing a sapphire crystal display back secured by six screws, 18k white gold A. Lange & Söhne buckle, case, dial, and movement signed37.5mm diam.