T206 History
 

Interesting read on T206 printing , and some pics of the rare proofs
https://static1.squarespace.com/stat...f_the_T206.pdf

I think that's a pretty good and interesting article.

Oddly, I haven't seen it before.

There are a few things that are ever so slightly off, but as an introduction to the crazier aspects of the set, it's excellent. (Like it's not just 6 colors, but generally 8, or that the civil war tax stamps didn't just tax sins, but darn near everything. )

It's always a fine line between too much detail to hold most peoples interest, and not quite enough. I think this hit that balance nicely.