The reference 2457 has the ingenious movement caliber 27-SC which was introduced in 1949 as the successor to the 12-120 SC. Brand: Patek Philippe Model: Calatrava Reference: 2457 Movement: 27 SC manual winding  Year: 1951 Case: 30.5mm Lug to lug: 39mm Box & papers: Box and extract from archives Location: Los Angeles Price: $11,999 plus shipping or best offer CONDITION & SERVICING * The case was lightly polished in the past and overall a very good example retaining its factory hallmarks. * Hands and markers are matching. The seconds hand is an early replacement. * The dial has slight aging showing a slight patina. * Recently serviced by our watchmaker. TIMESTAMP: [https://imgur.com/a/Ya41eN9](https://imgur.com/a/Ya41eN9)