Strange Cargo Door On This 747-400F

I caught this 747-400F departing from SEA one weekend while waiting for something else.  It is an original freighter rather than a converted passenger jet so it has the small hump and the nose door.  However, when I was editing the shots, I noticed that the rear fuselage cargo door has blocked windows on it.  This had me curious.  Is this a door that has been swapped on from a converted passenger aircraft or did the doors all have windows for some reason?  That seems unlikely so I am leaning to the former solution but anyone that is an expert on these things, please let me know.

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