I actually didn't know that. My father is the stamp collector in the family, and he knows nothing of the stamp culture here. It started collecting on his behalf, and now I want to start my own collection ... so, I will look into that! I am going to start posting some of the other mini-sets I got recently， too. Just so you know, I have largely been off steemit for a long time more because I was bogged down in writing a book about living in China. Still am! =)