Hidalgo: There are 10 different characters on the sheet and they each appear twice on each sheet. Based on 50 million stamps divided by 10 (each different character) that equals 5 million sheets. I could be wrong.
I asked a similar question about production numbers in the thread below and got some helpful responses, but for sheets with multiple characters/designs, it's still somewhat complicated. Math has never been my forte.http://goscf.com/t/80692
Would be great if the veterans of this forum could chime in and explain in a simplified way.