I don't have a color chart from 1973. The closest I have is from 1977. It could still be bone. Colors varied from year to year.
I have a double courier in the same color and I posted on my stories on instagram if anyone knew the color. Debi Barros responded Bone. Someone else also said Bone, but elaborated that the 70s bone is different. Mine is a metal tag pre creed
Thank you both for your input, I really appreciate your help.