I see things that look correct and I see things that don't look correct. I would have to see that one in person to make a call.
As to the trigger, it should be phosphate as Ithaca never used blued triggers on phosphate finished pistols. The trigger is a much lighter color, but if we are to believe that parts lay around for a year or more before they were used, the trigger wouldn't necessarily match.
Some of the markings on the pistol are hard to see from the light bouncing off the oil on the pistol, so hard to make a call there.