The dial is a classic Panerai “sandwich dial,” meaning the dial is made of two separate layers. The bottom layer has the luminous material applied (and on the PAM 315 this includes the AM/PM indicators at 3 o’clock) and the top layer has the numbers and markers cut out to allow the lume to shine through. This has become one of Panerai’s signatures over the years and it is tough to imagine what their watches would look like without the depth this adds to the dials.
Looking at the PAM 315 head-on, the dial is clean and easy to read. You have the hours, minutes, and arrow-tipped GMT hands centered, with an AM/PM indicator at 3 o’clock and both running seconds and a tourbillon indicator at 9 o’clock. Instead of sticking the 30-second tourbillon on the dial side, Panerai has chosen to conceal it on the back, though they have left a small rotating disc marked with a luminous dot at 9 o’clock as a reminder of what lurks underneath.