I have never seen any 5-inch 945 in any finish tone, no-dash or dash-1 that didn’t have the ambi thumb safety. If they exist (it’s possible?), I haven’t seen it.

The no-dash does indeed have no firing pin lock. I can only imagine they changed that to make it “50-State Legal.” The good news is that the firing pin lock of the 945-1 is a swartz safety type of design where the parts are actuated not by the trigger but rather by the grip safety. When you wrap your hand around the 945 and press the grip safety, a lever protrudes from the frame which pushes a button on the underside of the slide which unlocks the firing pin. The trigger pull, weight, smoothness and feel may be affected by many things but not by the firing pin lock.

Care is required upon re-assembly as you do NOT want to shear off this protruding pin from the frame by ham-fisting the slide.