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?