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The center part of the cabin's exterior, between the hatches (this one is on the pilot's side of the spacecraft, with the forward end of the spacecraft to the right of the picture.

At left note one of the "stoppers" for the hatch (surrounded by the off-white tape). Farther to the right, note the recessed area for the hatch latches.

I believe the black oval with the two silver rivets is the Smithsonian Institute property tag.