Luminor collection is a benchmark for visibility in hostile conditions. Panerai Luminor watches were especially designed for the use by the Italian Navy. The collection was designed to be dependable and durable to withstand great pressure and great depths underwater. The trademark of these timepieces is the metal guard over the crown preventing it in extreme conditions. The Panerai Luminor Marina PAM00631 has an automatic movement with 42 hours of power reserve and a date window at 3 o'clock position.