Thanks for those. I'll try to get my 2 out later today (going to be 102 degrees, I'm staying inside today ;-) ), a try to get a decent pic or scan to compare. I'm guessing you're right that there will turn out to be more than 3 variations.
You wouldn't have any recommends for a book or article on how the plates were made/put together? Back in the day I had some printing/litho/engraving in art classes at university, but that was so long ago and not really translatable to currency production. Maybe I'm just getting cabin fever but it seems like it might help me better understand how the varieties came about and which ones might be significant and which ones "forgettable".
You wouldn't have any recommends for a book or article on how the plates were made/put together? Back in the day I had some printing/litho/engraving in art classes at university, but that was so long ago and not really translatable to currency production. Maybe I'm just getting cabin fever but it seems like it might help me better understand how the varieties came about and which ones might be significant and which ones "forgettable".