PANERAI LO SCIENZIATO LUMINOR 1950 TOURBILLON GMT
Panerai is known for its Calibre P.2002 with an eight-day power reserve, and there is also Calibre P.2003 (10-day supply). So Calibre P.2005/ T, which drives this watch and has a six-day cache, does not break any internal records. That said, it bridges the gap between the ubiquitous threeday engines (Calibres P.4001 and P.4002) and eight-day motors. The six-day reserve comes courtesy of three spring barrels connected in series. An indicator on the back shows the remaining supply.