The Radiomir 1940 is presented for the first time with an automatic movement and the brand new in-house Panerai calibre P.4000 calibre which was fully designed and assembled by Officine Panerai in Neuchâtel. The distinctive feature of the new calibre is it off-centered oscillating weight, winding in both directions, just like the distinctive micro-rotor inside many of the Patek Philippe automatic movements. With a diameter of 13¾ lignes and just 3.95 mm thick, it has been developed to integrate perfectly with the proportions of the Radiomir 1940 case. The new P.4000 calibre is the first Panerai automatic movement with an off-centered micro-rotor. This means that the rotor is smaller in diameter than the calibre itself: a sophisticated technical solution which enables the movement —and therefore the watch itself— to be much thinner.