This pre-owned Patek Philippe Perpetual Calendar model 5140 has a leather watch strap and comes in an 18 CT White Gold casing. This model is supplied with a year warranty. The Perpetual Calendar Moon Phase uses a self-winding movement and is part of the grand complications collection. This timeless model comes with the sophisticated moon phase indicator as well as the perpetual calendar and leap year indicator; all balances deftly with the intricate and classic Patek Philippe design.