A. Lange & Söhne Lange 1 Tourbillon Perpetual Calendar "Lumen"

The A. Lange & Söhne Lange 1 Tourbillon Perpetual Calendar "Lumen", reference 720.035FE, combines a perpetual calendar and tourbillon in a 950 platinum case. This is a limited edition of 50 pieces. The case measures 41.9 mm across and 13 mm high, has a see-through back and is water resistant to 30 metres. A black alligator leather strap closes with a platinum folding clasp. Self-winding calibre L225.1 comprises 685 parts. The movement runs at 21,600 semi-oscillations per hour with a 50-hour power reserve. The semi-transparent black dial is made of sapphire crystal and carries an outsize date, weekday and moon-phase displays and a day/night indicator.