Authentic grilles (the center sections) were cast. There was one style. No welded bars. The "bars" on cross section appear almost as an "L".
Nearly everyone I have had has a tiny date cast on the very bottom bar.
Even the service replacement parts were identical to the grilles installed upon the assembly line.
I have millions still floating in my craniumThanks much Kube, one less nagging question floating around in my brain.