2013 pre-owned Royal Oak Offshore Chronograph Michael Schumacher 44mm from Audemars Piguet featuring grey, titanium, octagonal face, automatic movement, rubber strap, pin-buckle fastening, baton hands, three chronograph sub-dials, date indication, screw-down crown, two chronograph pushers and skeleton case back. 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..