To revive an old thread and to end the guessing,
I own a '71 Nissan 2400GT and have the chassis tags of another Nissan 2000GT Left hand drive.
Also there is one other 2000GT alive in my country the Netherlands.
As far as I could trace there were a total of 40 2000GT's and 2400GT's sold at the time.
The car is designated HGLC10 for the 2400GT and GLC10 for the 2000GT. Engine is single carburator L20A or L24.
Apart from being LHD the rear lights were unique for this car as far as I'm aware,
Also no mentioning of "Skyline" on the car.