The Luminor Marina Automatic range consists of watches with cases 44 mm or 40 mm in diameter, fitted with a Swiss automatic mechanical movement: the Panerai calibre OP III, with 42-hours power reserve and certified by the C.O.S.C., the Swiss official controller of chronometers. They are available with an alligator strap in different colours or with a metal bracelet of exclusive Panerai design. The 44 mm watch bracelet is in titanium and steel, integrated with the case and not interchangeable with a leather strap. The 40 mm watch bracelet is in polished and brushed steel, interchangeable with a leather strap. The functions of the Luminor Marina Automatic watches are: hours, minutes, small seconds and date.