Piaggio P133.It was an evolution from P108 with Piaggio PXV RC or PXXII 18 cylinders engine ( the latter with a complex two-stage three-speed centrifugal supercharger) for 1650-1800 HP at take-off, for a maximum planned speed of 490 km/h.Bombload up to 4800 Kg.Armament: two turrets on the back each with a 20 mm Mg-151, 1 20 MM gun inthe tail, one in the fuselage step, one in each side, on blisters, 4 Safat 12.7 machine guns 3 fixed and one trainable on the nose.
Regia Aeronautica ordered a preliminary series of 6 bombers and a prototype was nearly ready in Piaggio factory in Finale Ligure in 1943.
(Data and pictures from Aerofan-April 1998, n.16 and Dimensione Cielo pocked books, n.6, Bizzarri Editions-Italy-)
Unfortunately this is the best picture I could find....if someone had a better image I would like to see it very much........In post-war Italy most of the iconographic and technical material was removed from industrial archives and destroyed by the ashamed industrial leaders and workers who feared that their works were interpreted as an "active collaboration" with the Fascist regimen.Such a suspect could cause serious damages to your health in 1946......