patek-philippe-ref-5136g-e58a on Legacy-edit Sphere from
Produced for only 4 years from 2003-2007, reference 5136 was the successor to the vaunted reference 3940. At 2mm larger, it is a much more modern size and was delivered exclusively with a detachable bracelet. The watch is an extremely wearable perpetual calendar. This example is from the first year of production and features a sigma dial.