The card on which an SSN is issued is still not suitable for primary identification as it has no photograph, no physical description, and no birth date. All it does is confirm that a particular number has been issued to a particular name. Instead, a driver's license or state ID card is used as an identification for adults.
https://en.wikipedia.org/wiki/Social_Security_number
Thinking about it I am not going to swear to the colour, could be blue, OK I need to try and find it.
I am a few editions back but I think this is more like it, wonder what was brown.
I assume my Employer uses E Verify, now I did not when I was doing I9s.