So-Called Dollars

I see there isn't a category for these, maybe there should be one.
Any way I've been on the hunt for one of these for a long time.
I've even bid on some, but yesterday I was able to land one.

 

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Is there a standard reference work or these?

 

@Tall Paul
,https://www.so-calleddollar.com/books/

 

I think that it's pretty neat whatever it is.
What is it made of?

 

I think I have some confusion on these. I always thought the Williams Jennings Bryant "Free Silver" movement of the late 1800's that spawned a batch of politically themed pieces that generally showed a value of "Not Worth A Damn" were what we deemed as "so called dollars".... Am I off base here?

 

@SensibleSal66

 

If you go to the link provided, the book description has an explanation for what "so-called dollars" are.