kanguruh,
I am not an authority on the Fw 190, but according to Deitmar Harmann all D-12s and D-13s had the same armament: one MK 108 30mm cannon firing through the prop hub and two MG 151 20mm cannons. Once again, I cannot verify that the Fw 190 in the picture is a D-12. Good luck buddy, I'm betting that someone on this sight has the answer for you. Jeff