When you flip the case over, you start to notice that this is definitely a modern watch. Most notably, there is the in-house P.3000 movement looking back at you through the sapphire caseback. This is a manually-wound caliber with three days of power reserve, coming via two spring barrels. The P.3000, which beats at 21,600 vph, has proven itself to be a solid workhorse for Panerai since the company first announced it seven years ago. Its large size (a diameter of 16 1/2 lignes) helps to fill out the large case nicely. This watch's vintage inspiration, of course, came with a manually-wound Rolex movement inside.