I have the “54” tag with a “6” beneath it and another little plate with a “6” on it. The little plate is green with white 6 and the 54 plate is yellow numbers but is rusted where I can’t tell the background color. I seem to think I saw one somewhere that was green background.

1954 Chevy custom 261CID, T-5 5 Speed.
1952 Chevy 6400 2 ton hydraulic flat bed.