This is a 1956 Chevrolet non- wagon bumper. Note that the license plate is mounted on the trunk
This is a 1956 Chevrolet wagon (including Nomads and sedan deliveries) rear bumper. The license plate is moved to the rear bumper so it is still visible when the tail gate or lift gate is open.
Here is a photo of the first version of Tokyo Rose showing the non-wagon bumper with the license plate attached to it.