By Plymouth... What Colors?

My "By Plymouth" tag came off the rear of my 73 cuda when I was washing it the other day. This is the call out just below the 'cuda emblem. I want to make sure its the correct colors.

The most common one I have seen is black background with silver letters.

I have also seen them white backgroundwith black letters.

What is the correct color for the 1973 year. Thanks in advance.

Don

My 73 cudas is black and silver letters.