Which era did you ride public transit in Chicago?

Recently I've shown a video courtesy of CTA documenting a trip north along the red line from 95th street. It was to show what's beyond the south side as the trains head north to the other side of the city at Howard Street.

Today, I wanted to share this with you. This you might see if you were on fb and it asks for one thing: using the numbers you see on this picture which era did you ride CTA.

My picks was 2 & 3, and I'm not sure why there were broken into two different eras. That paper transfer and the token seemed to have been used hand in hand when taking CTA during the 1980s and early 1990s. Either way sometimes I miss that era as it seemed like much simpler times especially as a child.