Rolex Vintage End-Links authenticity challenge

[aram]

I' love to learn. I know a little, but could use any help from more experienced enthusiasts.

I'm on the fence about a few of these end-links.
I started opening up old Rolex band parts boxes, and need some help determining if a few of these are original Rolex or not.

My thoughts:

First pair: Looks vintage, but does not look like it has Rolex printing.
Second pair: Top looks legit, bottom looks like a lesser quality stamp.
Single: Looks good to me.


What are your guys opinions?