Im ready to be shot down in flames by saying the first commercial Boeing to have Autoland was the B747/400 and that was because Lockheed brought out the L1011 Tristar with it built in.
The 747-100s had autoland Cat3a but it was fail passive, only two autopilots, the 747-200 had three autopilots and was fail active, Cat 3b. It wasn't a great system. Lots of red and amber lights and hard work for the flight engineer.