"You can ID a car by its blank numberplate!"
The size and shape, the white outline and the location of mounting screws on the number plate says Australian, particularly state of Victoria. "54 Chevys were built by Holden in 1955, so tail lights are locally sourced. That part was easy, but I didn't know the car. A book I have says there was a car called Tontala made in '55, but it's design was unknown. What else could I guess? And then be wrong.