It was actually a 747SR-46, which had the standard 747 body. It was involved in a tailstrike in Osaka in 1978. It was repaired incorrectly by Boeing, through the use of single instead of double rivets on the rear pressure bulkhead.
The aircraft took off on the 12/8/85, operating JL123 to Osaka from Haneda. Its rear pressure bulkhead failed and despite the best efforts of the crew, the loss of hydraulic power was such that the aircraft became uncontrollable and eventually ploughed into Mt. Osutaka, in a mountain range which was actually only about 30-40 miles east of HND, across Tokyo Bay. 520 died and 4 survived.
A Boeing metal expert subsequently discovered in tests that the number of cycles flown in a simulation, based on the repair carried out was almost exactly the same as that flown by the 747 since the Osaka incident.