This is a replica Propeller Shaft (Driveshaft) for a Nissan Hakosuka GT/GT-X 2Dr.
It has been balanced and the length of the shaft is 1058mm from the spline to mounting surface.
This cannot be used on 1970-71 cars due to being spline type while those years are flange type.
For 1972 Nissan Skyline KGC10 2 Dr