I think SCDs are cool, but they are one area that is still unexplored by me, and as such, I am still ignorant of a lot of the varieties that are out there.
Very informative thread. I had no idea TPGs were still designating "so-called dollars" all the way to the present time. I thought it was an 1800s-early 1900s thing.
I think an expanded rabbit hole project would be to match so-called dollars with elongated cents rolled at the event that the so-called dollars are commemorating. Could keep one busy for a few years.