Hey Mel,
Great collection you have there! My caps all look their nearly 40years old, and what a difference to see what brand new ones looked like! I have a '72 C10 fleet side swb. The grill has the blue bow tie, but 3 out of 4 of my caps have the yellow ties, the other is blue (my brother-in-laws tire shop didn't put it back on correctly after a rotation and it came off. All he could locate was a blue one....I still give him a hard time about that one.

. But your posts above makes me think that all them should be blue, maybe?
I am the 3rd owner, and just assumed that the yellow ties on my caps were original equipment. Just interested in what you think.
Restoring my wheels and caps is something I'm interested in doing sometime this year.
Cool stuff you have!