This was a special larger model of the Nautilus available only in white gold from the first generation of the Nautilus family.
Like the rest of the Patek Philippe Nautilus family, Ref. 3711 has the well-known integrated and water-tight “porthole” case penned by Gérald Genta. But this time the case was even larger than before, measuring 42 mm by 44 mm. Ref. 3711 was introduced at the Basel Fair in 2004 in white gold and never made in steel only.
Ref. 3711 uses Patek Philippe's Cal. 315 SC.