Black platinum/leather pre-owned Saxonia Datograph Perpetual Calendar Tourbillon Limited Edition 41.5mm from A. Lange & Shne featuring round face, automatic movement, calfskin leather strap, index hands, screw-down crown and chronograph counter. Original box, papers and WatchBox certificate.. This item comes with a standard two-year warranty from WatchBox.. This watch has been evaluated and authenticated by a WatchBox in-house Swiss-trained watchmaker..