One of the defining characteristics of the Luminor Due to this point has been its thinness, and indeed it remains so in the 45mm and 42mm versions, whose thickness relative to diameter is much lower than is typical of a Panerai watch. This isn't really the case in the new 38mm Luminor Due, which come in at 11.2m thick. This may be because the movement powering the watch is an automatic, the caliber OPXXXIV. It's a new movement for Panerai, what the firm chooses to call a "group movement," which means that it was developed by Richemont and is available to brands within the group. However, the movement has been modified to suit the requirements of Panerai, which included the three days of power reserve as well as the subsidiary seconds at the nine o'clock position. The OPXXXIV runs at a fairly standard 28,800 vph and features silicon for the escape wheel and the pallet fork, but notably not for the hairspring, which is of the standard Nivarox type.