The A. Lange & Sohne Grand Lange 1 41.9mm watch. Model reference: 115.026. This watch features a round platinum case (41.9mm diameter, 11mm thickness) with see-through sapphire crystal caseback, silver dial with silver hands and applied Roman numerals and index hour markers, power reserve indicator at 3 o’clock, sub-seconds dial at 5 o’clock, patented large double-window date calendar at 1 o’clock, 52 jewel #L901.2 Caliber manual-winding mechanical movement with 72 hour power reserve, scratch-resistant sapphire crystal, water-resistant to 30 meters. Included is a hand-stitched, black crocodile strap with an A. Lange & Sohne platinum ardillon buckle. Case, dial and movement signed A. Lange & Sohne. The watch comes in original packaging, with a set of documents.