Panerai's in-house movement the P.9000:
"The P.9000 calibre, created entirely by Officine Panerai and used in a series of Luminor 1950 and Radiomir models, is fitted with various functions: it is an automatic calibre with a 3-day power reserve and a unique technical design which makes these movements immediately recognizable.
The calibre has a diameter of 13¾ lignes and numerous features: two barrels which guarantee 72 hours of power reserve; a single piece rotor which winds by moving in both directions thanks to an automatic ratchet device; a balance wheel with adjusting screws, oscillating at a frequency of 4 Hz; a date display and a seconds reset device which resets the seconds hand, enabling the watch to be synchronized perfectly with a reference time signal.
To house this movement, a specially made version of the Luminor 1950 case has been designed, keeping the proportions of the original but featuring a slightly less convex sapphire crystal which only barely protrudes from the bezel." [Panerai.com website]
GEN PAMS that have this movement
364, 389, 505, 393, 508, 388, 328, 312, 305, 523, 359, 352, 392, 351, 382
Assuming the picture that you have posted is of a ceramic version it could be of a current rep 441 (new one will have p.9001 movement) or a 508 (which i'm not sure is out yet). Ofcourse, the rep versions will carry non-gen p9000 movement. I've seen A7750 movement or ETA movement in the reps.