When collecting a series, sometimes the notes / coins / denominations you don’t see are almost as interesting and telling as the ones you do see.
I remember a few years ago when I first started looking into and trying to collect the Zimbabwe hyperinflation notes… I found the 100 Trillion note first and very easily. It’s the definitive poster-child of the series after all. I also quickly and easily found the 50 Trillion, 20 Trillion and 10 Trillion notes. Then I tried to search for a 5 Trillion… and a 1 Trillion… and a 500 Billion… and I found nothing. I tried looking for a 100 Billion,